I have Both L4D 1-2 in PC and KZ2 - 3.
IMO KZ3 is a better game overall.
*FAR better graphics not even a competition here.
*Better multiplayer package overall(has co-op AND competetive)
L4D is FUN real FUN atleast for the first hour after that it gets repetetive but atleast L4D offers more fun arsenal of weapons to kill zombie(shovel.frying pan etc). Story/campaign mode isn't even debatable both KZ and L4D isn't really STRONG in this area.











