*** Warning. Largest post in Macrumors
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1. OS X.
2. Free Upgrades when compared to Windows. Windows 8.1 is an update, not an upgrade.
3. Uses much less electricity over a desktop Windows PC (an iMac uses around 35 Watts idle and 90 Watts maxed, where as a desktop PC could uses 5X that easily).
4. No tower will look as good as an iMac.
5. It's very (very) quite.
6. It contains all the software I love to use (where as Windows machines that you never built usually contain Crapware).
7. OS X (again) runs so smoothly.
8. Revert To (an OS X feature that saves an document or file type at certain points and allows you to revert back to anyone of them or even drag content from an previous version to a current version, and best of all this is enabled by default on all apps that use it and it doesn't take up a lot more space because it only saves the changes).
9. Peace of mind (well, if a custom PC goes wrong, you and only you is to blame).
10. Piece of mind II (there is 0 viruses out there for OS X. There is still Malware/Trojans but these can be avoided with simple internet skills (in other words, just don't download crap).
11. Never slows down (I have always found myself having to reinstall Windows due to it slowing down to a crawl after 6 months to a year).
12. The Apps (Time Machine, iMovie, Final Cut Pro, iPhoto, Aperture, Pixelmator, Garage Band, Pages, Numbers, Keynote as well as all the other pre-installed apps). They are all easy to use, have no learning curves, and are useful. Finding even paid applications on Windows can still be a pain.
13. The fact that it is no longer worth nothing when you decide to sell it (in either 6 months or 6 years, it is still worth a lot of it's original value). Wit a custom PC geared for gaming, it is worth nigh on nothing in a year or two's time because it is old news and can't run the latest games as well as the fact that there is now better hardware out.
14. Free Software Upgrades II (Return of the Software Upgrades). Mac users get free OS X upgrades once every year with amazing new features, as well as performance enhancements.
15. No more registry. It's god awful
16. It works with all other Apple devices.
17. It works with all other Apple device's II. Continuity in the upcoming 10.10 upgrade allows us to do an even greater magnitude of things with all of our devices that no other platform offers.
18. RAM compression. Windows has RAM compression, but nothing anywhere near the scale of OS X. On a Windows system with 8GB of RAM, when you hit the 8GB limit, you will start to page out to HDD/SSD and your performance will dramatically drop. On OSX, 8GB of RAM can be pushed all the way to 18.5GB before full page outs (using the WKdm compression algorithm).
19. Facetime, you can't beat the simplicity of it.
20. The App Store is much larger than the Windows store (for desktops that is, I'm not talking about all those mobile games you can't play on your non touch screen gaming rig

).
21. Quicktime screen recording. Us Mac users can screen record without additional software.
22. Full screen apps. Full screen on Windows is just a Windows that is blown up to the resolution of the monitor, a full screen app in OS X is seen as a space and can be cycled through.
23. Mission control. Mission control is considerably more useful than that card based switching Windows has (not sure if Windows 8 does it).
24. The fact that Apple doesn't have awful luck with OS releases. Every second Windows launch is a failure now (Win Me, Win Vista, Win 8...).
25. Warranty. Speaks for itself.
26. The Mac
CAN game.
27. The Windows fanboys. They hate the Mac and have never tried it. Almost all Mac users have came from Windows, so when a Mac users states that they hate Windows they know what they are talking about. Windows users just come out will utter rubbish about Macs that just are not true.
So there is 27 easy reasons for me.
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I'm no Apple hater, I own an ipad and am planning on getting a macbook air soon, but for desktop computers windows is still the way to go- so much so I don't understand why you would get an imac ? If you build your own computer you can customize every single part and swap one out if you want a newer video card or get more RAM or whatever;
-Windows 8.1 pro 64-bit (Windows 8.1 is just so open, and the flaws of Windows 8 are over-emphasized, I can install anything on it, no restrictions, and having a non-crippled Office 365 2013 version is great) If you absolutely can't stand Windows there's always Hackintosh. I got 8.1 pro $70 student version
-NZXT Phantom 410 case (massive but aesthetically pleasing and good airflow) $50 with rebate, has tons of USB 3.0 and 2.0 ports, all display options you want
-Intel core i7 4790k processor (4.0 Ghz quad core) $270
-EVGA nvidia 770 Gtx GPU (Can run basically any modern game at 60 FPS 1080p) $320
-8 Gb hyperjaw RAM (Plan on upgrading to 16gb RAM when I can afford it) $70
-Seasonic 750 Watt EVO power supply (Runs beautifully quiet, can handle any editing, gaming, etc.) $100
-Samsung 250 GB SSD (Everything is blazing fast, windows startup is 3 seconds, programs open instantly) $110 on sale
-Gigabyte Z97 G1 Gaming Motherboard (Excellent overclocking options, gigabyte Bios is very intuitive, has a built in sound card and amp, good for sound quality and gaming capabilities) $140
That's $1130 for a PC that I DARE you to find an imac of equal quality/power at the same price
With the power of my Nvidia 770 GTX I also purchased an Asus 27" 1440p LED PLS display for $480, gaming is astonishingly good on this display. Maybe you could find an equivalent imac for $2,000+, but for desktops deciding on every single part, the experience of building your computer, the bang for the buck raw power, iMacs don't make sense.
But your build will not be cheaper. Yes, the initial cost will be, but after paying for much more electricity to run it, Anti Virus every year, Windows upgrades, and awful re-sale value, the Mac will come out cheaper. Bellow is a little comparison I done a while back:
I have heard and read a lot about people saying iMac's are more expensive over Windows PC's and wanted to make a thread here to show the real colours of this argument; making it more clear for buyers. I have below several price and spec comparisons between the iMac and a Windows PC in several different terms (like All In Ones, Desktops, Build Your Own, Light Users and Heavy Users). For each comparison I have added the price of both the compared iMac and PC's price after 1,3 and 5 years. So I hope you enjoy the read, and hope that it allows for people to see the real difference in price between an iMac and a Windows based PC. Enjoy.
First Comparison - iMac Vs. All In One Windows PC
For this comparison, I have chosen to compare the entry level iMac to the best (similarly priced) Windows 8 All In One I could find; the HP Envy.
iMac @ £1,149/$1,299/1,299
Processor - Intel Core i5-4570S | 4th Gen Haswell | Turboboost's from 2.7GHz > 3.2GHz | 4Mb L3 Cache
Cores - 4 Cores | 4 Threads
RAM - 8Gb DDR3 1600Mhz
GPU - Intel Iris Pro 5200 | 128Mb eDRAM
Storage - 1Tb 5400 RPM Hard Drive
Display - 21.5 Inch IPS Fully Calibrated | 1920 x 1080
I/O - 4 USB 3.0 | 2 Thunderbolt | SD Card Reader | Gigabit Ethernet | Bluetooth 4.0 | Headphone Jack | No Optical Drive
Wi-Fi - 802.11ac
Camera - HD
In the Box - iMac | Wireless Keyboard | Magic Mouse/Trackpad
Operating System - Mountain Lion (with free upgrade to Mavericks)
HP ENVY Recline @ £1,049.99/$1,199/1,199
Processor - Intel Core i5-4570T | 4th Gen Haswell | Turboboost's from 2.9Ghz > 3.6Ghz | 4Mb L3 Cache
Cores - 4 Cores | 4 Threads
RAM - 8Gb DDR3 1600Mhz
GPU - NVIDIA GeForce GT 730A | 1Gb
Storage - 1Tb 5400RPM Hard Drive
Display - 23 Inch | Multi-point Touchscreen | 1920 x 1080
I/O - 2 USB 3.0 | 2 USB 2.0 | SD Card Reader | Gigabit Ethernet | Bluetooth 4.0 | Headphone Jack | No Optical Drive
Wi-Fi - 802.11 b/g/n
Camera - HD
In the Box - HP Envy | Wireless Keyboard | Wireless Mouse
Operating System - Windows 8
The higher end 21" iMac has spec's more similar to the HP Envy but I chose to compare the entry level iMac with it to keep the prices similar. The iMac costs £100 ($100/100) more than the Envy and at an initial look (at least in terms of the processor and screen); the HP Envy seems like the better deal. The Envy features a processor more similar to the high-end 21" iMac (with an initial clock of 2.9Ghz, that Turboboost's to 3.6Ghz as well as a dedicated graphics card with 1Gb of video memory.) compared to the above iMac that only features a 2.7Ghz i5 with Turboboost to 3.2Ghz. Both All In Ones feature 4th Gen Quad-Core i5 processors with 4 threads (i.e no hyperthreading). Both All In Ones also feature a 1Tb 5400 RPM Hard Drive, which may not be the fastest, but offers great storage at cheep prices.
But that is about it for the similarities as from here on, both computers are configured differently. The Envy features a discrete graphics card with 1Gb of video memory compared to the iMac's integrated GPU that comes with 128Mb of eDRAM. This is a big plus for the Envy as more graphically demanding tasks should perform better with a dedicated GPU. It should be noted that the Intel Iris Pro GPU featured in the iMac is no slouch, as tests have shown it can hold it's own weight. The iMac features better I/O and Wi-Fi connectivity than the Envy. The iMac has 4 USB 3.0 slots (fast data transfer speeds), where as the Envy only features 2 USB 3.0, then 2 USB 2.0 (slower data transfer speeds). What does this mean, transferring data (be it photographs, video, music...) from a USB to the computer will take longer on the Envy if the 2 USB 3.0 slots are taken up. The iMac also features 2 Thunderbolt ports allowing for 2 external Thunderbolt monitors to be connected. Another difference with the connectivity is the Wi-Fi. The iMac features the new 802.11ac, where as the Envy features the older 802.11 b/g/n. This means that with a 802.11ac router, the iMac will perform much faster in wireless activity compared to the iMac. I have also noticed the 802.11ac helped when the computer was placed further away from the router, which could be a very important factor for a buyer.
Up until now, all that has been stated is slight changes; the following is where these two computers differentiate more.
The iMac features a 21.5 Inch IPS screen at the resolution of 1920 x 1080. The Envy features a larger 23" touchscreen with a resolution of 1920 x 1080. First off, the increase in screen size can be seen as a positive and a negative as it is (obviously) larger, but due to the Envy featuring the same resolution as the iMac, the iMac has a greater pixel destiny. This will make everything on screen appear sharper that the Envy. The Envy does however feature a touchscreen, something the iMac does not. This makes the Windows 8 experience much better as without touch it feels in-intuitive. Another thing to note is how well the screens are calibrated when taken out the box. Most users won't calibrate their computer monitors to perfection so it is important that the "Out the Box" quality is good. Both screens are IPS (allowing for wide viewing angles as well as high response times). The Envy features a well calibrated monitor, but it can't touch the perfection of the iMac's calibrated monitor. In all tests, the iMacs monitor is so close to perfection (in terms of saturation, colour accuracy, brightness, Gamut average and white point average). The screen is so well calibrated out of the box, professional should be happy to use this machine without even re-calibrating it. In the end, the Envy's screen is very good but the iMac is on top.
Now onto Pricing. In the initial prices, the iMac comes out more expensive by £100 ($100/100), now lets look beyond that.
The iMac (along with all new Macs) come with the following software:
iMovie
iPhoto
Pages
Numbers
Keynote
App Store
As well as others
And the Envy comes with:
Windows Store
Beats Audio Console
A few games
Looking above, I have only noted a small amount of software that comes preinstalled on each computer. It should be noted that the Envy (look most Windows PC's) comes with Crapware. This is software that has been installed on the computer taking up lots of space as well as slowing the computer down and is made hard (if not almost impossible) to remove. This can be removed if the user is willing to reinstall the OS but this can take several hours and can be very troublesome if the user struggles to get drivers for the PC (a good example is the drivers are on the internet, but you can't connect to the internet because you don't have the ethernet or wireless drivers). The Envy doesn't appear to bad with the crap ware installed, most of it is games that should be easy to uninstall.
Moving on, the iMac comes with Pages, Numbers and Keynote for free (also known collectively as iWork). These are a the Word, Exel and Powerpoint of the Apple world. I have used them extensively and have had no problems with them and never had something I can do on Microsoft Office that I can't do on iWork. For the Envy side of things, it does not come with Microsoft Office, that will set you back £79.99 ($99.99/99.99) a year for Office 365 or a one off fee of £190 (£229, 229) for the 2013 edition (that will not be up to date when a new one comes out, where as iWork gets free updates).
I have also taken into account electricity costs. The iMac uses only 15W at idle. The average cost to run an iMac for a year is £8.06 The Envy on the other hand uses around £20-30 to run per year. This is on average usage.
There is also Anti Virus Software to be taken into account. It is still a fact that you are less likely to get a virus on a Mac with out Anti-Virus than you are on a PC with Anti-Virus. So I'm not saying it is impossible to get a virus on a Mac, I just saying that you are still less likely than if using a PC with. You can still get AntiVirus for Mac, and is usually free compared to being on average £19.99
for a PC.
So here are the figures:
iMac
Initial Price - £1,149
iWork - £0
iLife (for Movie Editing) - £0
Running cost per year - £8.06
Anti-Virus - £0
HP Envy
Initial Price - £1,049
Office(per year) - £79.99
Office (One Off) - £199
Movie Edit Pro - £39.99 (was £59.99)
Running cost per year - £25
Anti-Virus - £19.99
Now, instead of just adding that up, I am going to add up different values depending on the user.
Basic User
Wants to web browse, check emails, do social networking
1 Year
iMac : £1,157.06
Hp Envy: £1,093.99
3 Year's
iMac : £1,173.18
HP Envy: £1,183.97
5 Year's
iMac : £1,189.30
HP Envy: £1,273.95
Contains - Computer, running costs and Anti-Virus.
As you can see, for the Basic User keeping it for 3+ years, the iMac is cheaper than the Windows All in One Alliterative. I would say though that if you come under the Basic user, a cheaper Mac (like a Mac Mini or Macbook Air) or a cheaper Windows PC/Laptop would suit you better.
Average User
Wants to do everything a Basic User does but also Work related things like documents...
1 Year
iMac : £1,157.06
Hp Envy: £1,153.99
3 Year's
iMac : £1,173.18
HP Envy: £1,314.00
5 Year's
iMac : £1,189.30
HP Envy: £1,364.00
Contains - Computer, running costs, Anti-Virus and iWork/Office(365 for the one year user, One Off payment for the 3 and 5 year user).
For the Average User planning to keep the computer for one year, both computer are similarly priced. For the average user that want's to keep longer than that, the iMac is much cheaper (with a difference of around £200).
Heavy User
Wants to do everything an Average User does but also uses the system more and edits Video
1 Year
iMac : £1,161.00
Hp Envy: £1,218.97
3 Year's
iMac : £1,185.00
HP Envy: £1,479.66
5 Year's
iMac : £1,209.00
HP Envy: £1,738.89
Contains - Computer, running costs(£30 instead of £25 as user is on more, £12 for iMac instead of £8.06), Anti-Virus, iWork/Office(365 per year), iMovie/Movie Edit Pro.
For the Heavy User, the iMac is considerable cheap than the Windows based All in One.
iMac vs Custom Build
For this comparison, I will compare the high end 27"(with upgrade to i7) iMac against a Custom Built Window's PC I configured at PC Specialist. I will also add the software from above as it is the Windows alliterative to the Mac's software.
iMac @ £1,939.00/£2,199/2,199
Processor - Intel Core i7-4771 | 4th Gen Haswell | Turboboost's from 3.5GHz > 3.9GHz | 8Mb L3 Cache
Cores - 4 Cores | 8 Threads
RAM - 8Gb DDR3 1600Mhz
GPU - NVIDIA GeForce GTX 775M | 2Gb Video Memory
Storage - 1Tb 7200 RPM Hard Drive
Display - 27 Inch IPS Fully Calibrated | 2560 x 1440
I/O - 4 USB 3.0 | 2 Thunderbolt | SD Card Reader | Gigabit Ethernet | Bluetooth 4.0 | Headphone Jack | No Optical Drive
Wi-Fi - 802.11ac
Camera - HD
In the Box - iMac | Wireless Keyboard | Magic Mouse/Trackpad
Operating System - Mountain Lion (with free upgrade to Mavericks)
Custom Built PC using PCSpecialist @ £2,058
Processor - Intel Core i7-4771 | 4th Gen Haswell | Turboboost's from 3.5GHz > 3.9GHz | 8Mb L3 Cache
Cores - 4 Cores | 8 Threads
RAM - 8Gb DDR3 1600Mhz
GPU - NVIDIA GeForce GTX 770M | 2Gb Video Memory
Storage - 1Tb 7200 RPM Hard Drive
Display - 27 Inch IPS Fully Calibrated | 2560 x 1440
I/O - 2 USB 3.0 | 4 USB 2.0 | SD Card Reader | Headphone Jack | No Optical Drive
Wi-Fi - 802.11n
Camera - Microsoft WebCam 720p
Contents - £80 tower, Microsoft Office Professional, Norton Anti-Virus 1 Year, Movie Edit Pro, Microsoft Touch Mouse, Arc Keyboard, HDMI, Asus 27" IPS Monitor
Operating System - Windows 8.1 Professional
Added better power supply and cooling which added around £130 to the price to make the computer quieter and cooler.
And all of that would cost £1,729 with no software, no anti-virus...
So in the end you get an uglier looking build PC for more money. The only way the Custom PC will be cheaper than the iMac is if you downgrade things or built it yourself.
So here you have reached the end. And the question I now ask myself is "Are iMacs expensive?". Yes, they are. "Are iMac's expensive compared to similar PC's? No. Defianatly not. Remember that you don't just by the computer and sit it somewhere, you use it and using it costs money as well as the software you use. So now I better go; I don't want to find this year has cost me more than £8.06 for running my iMac