Ive got 3 Xbox 360's and a PS3, I prefer the 360 over the PS3 as more of my friends are on xbox live and I think the overall user interface is better. I only have 3 games for the PS3 but probably 30+ (genuine) games for the 360. I think I'm addicted to the achievement system.
Funny thing was, I was a playstation fan till I got the 360 having owned the PSX and PS2.
I put the Wii down mainly cos I've only ever personally owned two consoles in my life - PS2 and Wii - and I play the latter more.
Games I've always done through the PC and I just don't have time for them really any more (although if I've got the raving hump and can't be arsed to do anything for a day, I'll quite happily go and create Sims and make them do crazy things for Sims 2)