i have both a ps3 and a 360, and i like my 360 better, because for one, all my friends have a 360, and i can play with them online, and 2nd, (correct me if i'm wrong) bluray uses full 1080p/i, and the majority of people don't have tv's that use 1080p/i, so the blu ray isn't that big of a deal to most people.
so take the blu ray out of the equation
IMO, the ps3 seems like more of a more business-like console, whereas the 360 is more based on a fun theme. yes, i understand you can change both the themes on them, but it still has that feeling to it.
say you want to take your console over to your friend's house for some system link action. your ps3, which weighs nigh on 15-20 lbs, is a bitch to carry to school, for example, if you're going after school. the 360 is a much lighter and more portable console.
i also like the 360's games better. not to say the ps3 has some heavy hitters, MGS and LBP for example, but the overall amount of decent games produced for the 360 just swamp the ps3.
this is just my preference. i find them both to be enjoyable, if maybe the 360 a bit more because it's mine and the ps3 is my dad's.
there's my rant for the day.