-First and foremost Halo is my favorite IP and Gears of War comes second.
-I know about 30 people that own 360's and only 2 that have ps3's.
-I like Xbox Live better because if feels like a community, where as Psn does not imo.
-360 has an awesome collection of XBLA games.
-Party Chat is amazing.
-I prefer the Xbox controller.
That's about it. Both console are amazing for their own reasons. I plan on getting a ps3 this year if there is a $100 price cut because I really want to play the Uncharted series and all Insomniac games.