<----. My vote should be rather obvious.
Mac just works better IMO. There is a lot more stuff you can do on Macs now.
.zip and.rar work on mac, windows Media player 10 is now on Mac. With boot camp I'm able to run Counterstrike: Source / Half life 2 on my MacBook Pro better than it runs on my PC. I also use bootcamp to work with Finale (music program i use for taking my Drumline music and exporting as MP3 so I can practice with it) The whole Microsoft Office package is available for Mac. There is also a freeware program called Flip for Mac that lets you view Windows Media content in web browsers as quick time. It's usefull for stuff like GorillaMask (website with a bunch of funny vids, usually in embeded WMP)
I also just like the interface better. And for the people who said they used them and didn't like them i would suggest using them for more than a few sittings here and there. Once you become familiar with the OS, all the keyboard shortcuts, features and whatnot you'll be much more comfortable using it. It just becomes more productive, and easy to use.
The hardware is great. The Intel chip runs like a charm and Rosetta lets you run all the old PPC programs that haven't been ported to universal binary or Intel yet.
Not be mention the security that is FAR superior to Windows.
k I'm done