Gamepro -- Killzone 2 VS Halo 3 (Is KZ2 a Halo Killer?) YES IT IS!!

[S.T.A.G.E.]

peshkavus said:
free online play = K2 wins
split screen with my buddies = Halo 3

MP = tie


Single play = tie


Stories = Halo 3


Gameplay = k2 (free mp online)


tie imo

So basically PSN gives KZ2 the edge for you.