I have a PS3, and I like it. I've played an Xbox 360, and I liked it.
All that it really comes down to is whether you're willing to pay for online play (or not for PS3), and if one console has exclusives you want that the other doesn't have. It's pointless to argue about how the controller feels, or whether the graphics are better than the other. You're looking for gameplay options.
So, imo, PS3.