Infinity Ward definitely, they created the first CoD where as Treyarch jumps in and gets too much credit for IW's work the only non-copied thing in WaW is Nazi Zombies and even then the offline play is BORING and the running around with a Browning or an MG42 is just unrealistic you needed two men to operate a Browning on a bipod let alone running around with one with only one man plus Treyarch patches too much stuff I mean don't get me wrong I hate having to watch out in a certain area in overgrown underground but theres still some added realism with glitches due to the fact that you never know if theres a sniper on one building or another in real life, with the right equipment, a sniper can get anywhere on top of anything but Treyarch has too many boundaries in place and I love the old school feature with MW, its fun to use with your friends in private matches. Sorry for the humongous run-on sentence its just the way I type lol.