I have a 360, and I feel it's the better choice of the two.
First and foremost, it is cheaper (which can be a pretty big consideration), plus the games are better, the backwards compatibility is better, and it is the console for online play.
I don't think the PS3 is bad, mind you, but I haven't regretted passing on it. I would like to have the BR player, but I'll admit I am a bit concerned on that. I bought a PS2 when a built in DVD player was all of the rage, and it was a first class POS. The thing worked well on all of two DVDs, and from there it was shot... and I found many more people with the same problem. I'd love to have the BR player on the PS3, but I'm not convinced of its quality enough -- given my past with the PS2 -- to justify picking it over the 360 for that reason.
At the end of the day, though, neither is a bad choice really. As much as many want to argue all day and all night over it, we're mainly talking about a situation of six in one, half a dozen in the other.