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what type of PS3 do you have, because if its the fat one then just dont bother getting modern warfare 2, there has been so many complaints about the game ruining the old ps3s and where the game gets stuck in the machine, it happened to my 80gb model which i just bought this year so i sent it off and im gonna get the 250gb model to replace it, i own an super elite so it will match :D, L4D2 is amazing on the 360, the multiplayer wont be as good though, but its one of my fav games of all time, but depending on your PC it can really lag but id rather have that than having my ps3 break down on me..................again, so i would say get L4D 2

If you like FPS's then COD 6 modern warfare 2 it has pretty solid reviews. L4D2 is great but get it sometime later COD 6 should be your main priority unless you are a fan of Zombie games.

Modern Warfare 2 definetly. Multiplayer online is insane. I play on xbox 360. No network problems few glitches although watch out for the javelin.

I have both and although both games are great L4D 2 is only good if you have friends to play it with other wise it is boring. So if you do have friends to play it with DEFO L4D but if not DEFO cod 6 as you don't need your friends to have fun.

BUT REALY JUST GET EM BOTH :P

Hope i helped

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cod MW2 on teh PS3 multiplayer is great campaign is ok.... but spec ops jesus christ infinaty ward were really smart to come up with that one its just fantastic and its coop!!!!!

MW2 -- FTW (for the win)

cod mw2 of course

codmw2 all the way man. psn Bryybear