Mac, hands down, legs up, face turned around.
I've worked with a mac on various occasions, and it's just so awesomely perfect, well, not perfect, but you know. Whilst this stupid excuse for a user-friendly machine blows up when I try to open word and freaks out when I open Internet. When more than 2 programs are active, this stupid failed mac-copy just starts to ignore every command and starts lagging every once in a while, I sometimes think it is programmed to do so. That's for XP, don't get me started on Vista...
I'm probably getting a Mac as soon as this things blows to bits, but too bad it's rather new. I also got it for pretty decent price because my dad ordered it through his work, so he go a company discount.
Mac: 7 || PC: ZERO