I have all of them. My favorite one is world at war. The game has a 26-level campaign, 20 challenge levels, and 12 multiplayer maps. This version also includes the British story, which is not included in the other versions. This means guns like the Sten MK 2 and the Mk 6 Webley Pistol are included in the game. Sadly this version doesn't have Nazi Zombies.
I have only played a bit of Black Ops and its quite fun. The zombie mode is interesting to. The game is VERY graphically impressive for being on the DS. The controls are fine but i prefer a keyboard and mouse or PS3 controller. They didn't have much choice though as it has to work on a DS. The gameplay is OK too. The campaign is pretty good to but I only played a bit. I think thats about all I can contribute.
I have only played a bit of Black Ops and its quite fun. The zombie mode is interesting to. The game is VERY graphically impressive for being on the DS. The controls are fine but i prefer a keyboard and mouse or PS3 controller. They didn't have much choice though as it has to work on a DS. The gameplay is OK too. The campaign is pretty good to but I only played a bit. I think thats about all I can contribute.
you gotta try world at war. its great and has a long campaign