I just have to clear up the PS3's lineup. Killzone 2 is NOT the only game.
-Killzone 2
-inFamous
-Fat Princess (if you include DLC, I can include PSN, right?)
-The Agency
VERSUS
-Halo Wars
-Ninja Blade (if you must include it, it's like including Lair in a PS3 2007 lineup)
-GTA4 Lost and Damned (which is apparently a game now)
-Star Ocean 4.
Basically, it's a tie, it depends on your gaming tastes etc. etc. etc.
You never know, both platforms could have titles now TBA 2009 which could become Q1. Hell, maybe Uncharted 2 can make it out in Q1. I know, not happening.