I have been a professional graphic designer for over 15 years now and have worked daily on both platforms. For years I would not play favorites and would recommend systems based on the needs of the individual.
I can no longer do that. Apple has been too good to me. They run faster over time, more consistent, less problems and you can generally be much more productive on Mac machine.
At home I have 2 Pc's that run XP that I built myself, and 3 macs. My brand new imac is the best personal computer that I have ever used. HANDS DOWN!
If you want to have fun with a computer and you want to revive your love for personal computing buy on of the new imacs.
Ok, now you can grill me!