They're both good. My roommate and I had a little debate last night. He's a ps3 nuthugger, but he also complains about every game that has a different button layout than Call of Duty, which makes me weary of his opinion.
I like everything for the PS3 except some of the load times. The blue ray player is awesome and the hard drive is large. Plus free online play is cool. The only real game available for the PS3 that's not on the 360 that's worth a damn in my opinion is Metal Gear Solid 4. Badass game/movie.
The Xbox plus's are that it's cheaper. Unfotunately, they do break down here and there. Just make sure you have as many vents possible, not being blocked off so it doesn't overheat. (PS3's overheat, too, just not as often.) Exclusive titles like the Halo series and Gears of War games are badass.
You'll be happy with either system. It really just comes down to how much you want to spend.