I use both and would choose a Mac every time (almost)
I have both a MacBook Pro and a Windows PC. I've run every flavour of Windows and on the Mac everything from System 6 through to the latest OS X. They both have their merits and their problems so you have to ask yourself what you will spend the majority of your time doing.
If it's playing games, developing Windows software, or spending all of your time in apps like Visio then stick with the PC, or at least Windows. As you are using a laptop I guess you are doing general 'stuff' - office, internet, music, photos etc. Both platforms do all of this but in their own way and a lot of the time personal preference comes into it.
I for one prefer the 'walled garden' of Apple. I don't find it restricting, I like that I'm not having to support my own IT after spending a day working in IT. iCloud does a lot of stuff that just works behind the scenes when you have multiple devices. Applications are easy to find, buy, install and update. Expose and multiple desktops is extremely useful when working on a laptop. And finally the build quality of Macs is generally very high. Yes there are some issues, but for the most part it's better to have something purpose built rather than a box of bits.
Things I don't like about Apple.
OS X isn't as good at browsing file shares on NAS appliances or file servers - the initial connection to the share can be a bit slow. It just feels more fluid under Windows - if anybody knows something I'm doing wrong here feel free to point me in the right direction.
There is a limited choice of desktop options, and future laptop models look like they will only have glossy displays. I like matt displays and I want a tower computer that is not Xeon based.
Windows is better for keyboard shortcuts. There's no OS X equivalent of Windows Key + E to open a new finder window for example
Overall I'd say OS X is more reliable than Windows, or more correctly Windows apps crash more, Windows itself isn't too bad. I recently built a new Windows PC for running VMware because Apple don't make a tower PC and £1500-2000 for a refurbed 2010 Mac Pro is not realistic. However if Apple did make the hardware I want I'd ditch the PC and buy a new Mac today.
In your position if you want a good solid laptop for every day stuff look at the 13" Macbook Air, or if you are doing more photo or resource intensive work go for the Retina Macbook Pro. I would put off buying anything though until the new products are announced in June. Assuming they are announced in June.