Macs are just better. When a program has a problem, the entire machine doesn't fucking lock up, just the program.
Not true. I've had a clean, non-internet, studio Mac hang on me many, many, many times. Some times it bought the bullet midway through tracking, and not only PT hung, but the entire rig. Not only that but the 'restart' button doesn't seem to prompt a restart. It just brought the comp back to the same hanging state it was in prior. Had to cut the power to it a few times to get it to clean boot.
The main difference for me is the OS. I can deal with Windows as I've been using it for many years, and I love the ability to customize my own hardware set-up, rather than buying pre-configured and getting severely ripped off. OSX however seems to run more stable, is a lot more user friendly etc. There are always things with OSX I wish Microsoft would take into account and incorporate into their own OS, but it never really happens. Vista is a tragedy.
The worst thing about PCs is Windows. The mass exodus to Linux I had hoped for never happened, so we're stuck digging through a shitpile... one, however, that I would gladly keep digging through after my numerous experiences with Macs.
Oh, and to mention, software compatibility is a huge one for me. There are tons of programs that haven't been ported over to OSX. A large number of applications/games/whatnot are Windows exclusives.