Killzone 2 is one of my favorite shooters of all time so i'll go with Killzone 2.
The multiplayer in this games is very fun but remember that you can't play coop split-screen in this game, not even online. In Resistance 2, you can play online coop though and the game is not bad at all, it's just not much as much fun as Killzone 2 to me.
[QUOTE="BigBrother, post: 0]I played Resistance 2 for a few weeks, then KZ2 came out and I have touched R2 once since then.
And I still think KZ2 is better than MW2, but that's just my opinion..[/quote]
I agree, KZ2 is better in just about every way, except multiplayer then it gets close, but taking single player campaign into consideration and what the two games offer in terms of graphics and such, KZ2 is hands down the better game.