I've owned both, i'm currently on a mac, a MBP.
I loved XP, it did everything i wanted it to, i took care of it, and it worked fine.
Now, i have a much better computer in terms of hardware than my PC, and OSX is also catering to my needs as of now. I was skeptical about not having Office anymore, but it's all been good with Pages, with a few things that I can't do as well, but also a bunch of stuff i couldn't do or couldn't do as easily...
It really is all personal preference. The main deciders were being able to use final cut pro, the design and the ease of use.
Just go with what you like, at this point both PC and Mac will do the same things.