There really aren't that many people who have knowledge and experience on both but prefer PCs. Most PC users I know who are also Mac literate use PCs because for compatibility with work systems, cost reasons, etc. Not usually because they prefer them.
I have knowledge and experience of both. I personally just prefer the way PCs work. That said, with Vista and now with Windows 7, my enthusiasm is starting to wane. Windows is looking too much like the Apple OS nowadays for my liking.
Apple's "security through obscurity" approach isn't going to last forever either. Give it another 5 years and you probably won't be able to tell the difference between Macs and PCs.