PS3 easily. Only thing the 360 has that beats out the PS3 is better online mode and PS3 is actually getting better with that.
Most games now are multi-platform, PS3 has a built in blu-ray, don't have to pay for online, better graphics, better controller (imo). I'd go PS3.
Not to mention most people that own 360s are on their second or third one. Never know when that thing is going to crap out on you. I've had my PS3 for about 2 years now and no problems.
I mean if you want the 360 for Halo or Gears I could see that. But everything else is beneficial towards the playstation.
You're just a cook...