This is apples and oranges, really. Many people who use macs do so for a couple of reasons:
1) the supposed 'user friendly' interface. As an ergonomist, I hate that phrase, but most of my colleagues use macs due to their highly intuitive interface. Having started with a PC, I cannot agree. How is sliding a disk icon to a trash icon supposed to intuitively tell me that that means 'eject'? Anyway, macs are pretty fast, and are wonderful for graphic artists.
2) the supposed fact that 'it never crashes.' Well, I've seen many macs crash, and many pcs crash as well. I will admit that the mac OS appears more stable, and of course is not anywhere near as 'hackable' as a PC, so that's a plus.
But the key for me, and for all of us I'd imagine, is that PCs have games. Sure, macs have games too, but one typically must wait a year or more after a PC game's release before it is available on a mac. And that's just too damn long.