Depends on what you want. Do you want to buy a separate blu ray player? Do you mind having low quality connections for online gaming? Do you only watch copy written movies? Do you own a PSP? Get a PS3. If you're not looking for those things, and want a cheaper system, with a better online experience, then get a Xbox. The 360 has a better warranty if it breaks than the PS3 which is a plus, and I think graphically it's a tad bit better because it's easier to program for. You also want to check out which community plays which game more. For instance....360 has a larger mortal kombat population, while ps3 has a larger street fighter population.

I've owned both systems, and personally I like the PS3 better because of the free online play, the controller, blu ray, and there really aren't any ground breaking first party games that would sway me in either direction. The price tag of the 360 is hard to beat though....so if it's a money thing, I would defiantly go for the 360.