Call of Duty: Black Ops Zombies $6.99 - $2.99 https://itunes.apple.com/us/app/call-of-duty-black-ops-zombies/id471063940?mt=8 Call of Duty: World at War Zombies $4.99 - $1.99 https://itunes.apple.com/us/app/call-of-duty-zombies/id338057689?mt=8
World at war, no doubt. More maps, less bugs, better controls, better atmosphere, just everything. I own both and trust me, I prefer WaW by a long shot.
Just some small advice for those planning on buying Black Ops to play online..... It doesnt work and hasnt done for months. Just a heads up.
Unfortunately I have to second this, and also say that the sound on iOS 6 is buggy. BO zombies just sucks, plain and simple. Get WaW. It's just better in every way possible, except graphics.
I always had heard BO was better. Oh well... Bought it a year or so ago and still haven't installed it. Doubt I need either version.