I'm going to have to pipe in on this thread...
I voted for the PS3. Really though, the PS3 and Xbox 360 are nearly identical, and you have to be examining pixels to tell any graphical differences, not to mention the fact that pretty much every game is multi-platform these days. The only good exclusives I can think of off the top of my head are:
360:
Gears of war (1,2)
Halo 3
Mass Effect
PS3:
Killzone 2
Resistance (1,2)
Little Big Planet
There are probably more, but these are the only ones I can think of.
I try to keep an open mind about all consoles, as I despise biased fanboys, of any system. The only reason I like the PS3 more is due to marginal things.
As for the wii, it has some great games. Metroid Prime, Mario Galaxy, Zelda and, the best of them all, Brawl. However, right now my wii is basically a Brawl playing machine, and that's it. There needs to be more good games for it.
As for the computer wars that have (somehow) developed in this topic, I'm going to start defending the Mac. Boot camp isn't an emulator, it is running windows, on your mac machine. There are no flaws with it, it works as well as windows ,which means it works pretty bad. I'm not much of a PC Windows gamer anyway, because consoles are just cheaper and more convenient (as in, your godly can-run-Crysis-on-High hardware that you have been bragging about becomes obsolete a day later)
For the record, most games aren't made natively for macs because PC's Windows machines are more popular. It's as simple as that.