I still play Grand Theft auto, red dead redemption, Always up for some Left for dead 2, The Godfather, And Mafia 2, waiting on the la noir to come out next month ,
For the ps3 - don't have many games on that, only Golden Ax, Conan, and Wrestlemania
LA Noir comes out next tuesday, some places will have it Mon at midnite. Not trying to be a fanboy, but you might want to consider getting it on PS3. The game is very big, and it's on 3 discs on the Xbox360, but on one Blu-ray disc for the PS3, so you wont have to switch discs. And I am pretty sure the PS3 has one extra case exclusive to it.
So consider these advantages against the fact that you like the controller better for Xbox.