To throw more logs in the fire...
Xbox 360 anyday. Even if PS3 has a decent game selection, id much prefer the 360 version due to the fact I know the online experience will be better. Doesnt matter which console spits more power, its a matter of what game preference people have.
About the only titles id care to play on PS3 is if they ever finish Final Fantasy 7 and the next Tekken game. Either then that, no thank you. :-)