personally im not a big fan of killzone and dont think they are that great, not only that but the controls feel weird. so my vote goes for crysis.
the crysis single player is a lot better imo, since you can go a lot of different routes to get to your objective(ie on the roof tops, through buildings in the sewers, or hell attempt to go on the road and kill your enemy's), where as killzone is more of a follow the single path and shoot bad guys type of game.
