I like them both, but honestly the Xbox 360 has provided me with more fun.
The PS3 has great Exclusives like Infamous, Fat Princess, Little Big Planet etc. I don't like how the theme is so black or blue, and it doesn't have all the coverage of gaming news the Xbox does, the controller feels a bit too small for my huge hands too, but it's fun.
The Xbox has a larger controller which I like a little bit better, Has a nice theme, has alot of easy to browse media and news, my favorite game series is on there too (Fable)
I am on team Xbox because it is just more user friendly? Batteries are easy to switch and cheap where I get them, It has Kinect which is really cool, can't wait for Fighting games on there, and Kinectimals is fun when you're high.
I think you will have more fun with an Xbox if you are looking for online games, or any form of multiplayer, if you are looking for mainly single player get a PS3.
Also buy everything at Costco