I think what I prefer most about the Mac is that "it just works". I know that's a trite advertising slogan, but it has more than a grain of truth. It's a tightly controlled environment, and that's where that shows. Programs integrate better, external hardware works better - the whole integration of stuff beyond just the computer and OS tends to work better. The result, for me, is that I find myself worrying far less and screwing around with the computer hardware and software components, and am able to focus more on the work I'm trying to accomplish.
This is it for me. Any work needed to be completed using a Windows PC is generally greeted by a groan and acceptance of a long slog through whatever it is. Where if I'm working on a Mac, I actually seem to enjoy doing the work more, becoming more productive. It may be about perceptions, but they can be important to how you work.
I didn't 'choose' a Mac, those years ago when I got my first home computer, I asked a good friend of mine's father, who ran a music store, to help me set up a home studio. He included a Power Mac G5 in that set up, and it still works more or less as well as it did back when it was the latest model. I used Panther (10.3) for years, right up until last year in fact, and still thought it was better than whatever Windows OS I was having to use through work or college.
Switching will take substantial effort, you'll need to open up to a different way of doing things, embrace the different OS world and applications catalogue. Be patient when you come up against something that frustrates you, finding a Mac version of a Windows program you love for example, but you will find it, a lot more often than not.
Probably sounds like I'm swooning, but truly, I'm no tech head, when I got that G5 I barely knew anything about computers (I didnt know what Safari was and used IE for so long lol, till a friend showed me) but getting to know and settle into the Mac world and way of doing things has actually mean I've loved using a computer, loved working on one, and am now moving forward into web design as a career. I might be wrong, but I strongly believe had I got a PC back then, I might have stayed 'computer ignorant'.
You can laugh now
