Well, for me, it's breaking my heart to have to choose.
On one hand, the 360 version has extra content, a larger online community, and achievements, which give me a stiffy every time I get one.
But on the other hand...
The PS3 was the console that I swore I'd buy and cherish. There's a bit of loyalty here, plus I find the Xbox style controller annoying for the game.
Sigh...