Black Ops 2, like all Call of Duty titles, is best enjoyed in multiplayer. Black Ops 2 Wii U is a competent port, and the best part of the multiplayer is the dual screen split: one person on the TV, one person on the pad. However, the Wii U's market penetration is very small compared to the PlayStation 3, and so unless you intend to play with the pointer instead of sticks, or really value the TV/pad local multiplayer, the vast online community for the PS3 version would naturally make it a better choice on that platform, not Wii U.
ZombiU is full of jank and design problems, but it's also very unique, bold, and truer to the survival horror genre than any game I can think of from the past few years. It's slow, methodical, a quite difficult, but it's hard to put down once you get caught up in the atmosphere. It's a love it or hate it kind of game, and if you cant see yourself enjoying a methodical survival horror with a slow pacing and high difficulty, ZombiU won't win you over.