360, because it had the titles I wanted to play. I seriously considered getting a Wii as well, but realised that I wouldn't play it for very long before packing it away... it just doesn't have the variety of games I want to play.
I have no issues with the PS3; the only reason I didn't get one is that my budget won't stretch to both a 360 and a PS3, or at least I'm not allowing myself to buy both. (Besides, I don't have anywhere to put the PS3 in my media cabinet, with the receiver, TV, VCR, DVD, 360, rabbit ears, and 3 speakers stuffed in it already.)
-- Steve