I'm going with zombie mode ever so slightly. If the missions in MW3 lasted as long as they did in MW2, then perhaps Spec Ops would win. As it stands, some of the missions in MW3 are insanely short. That final one with the AC-130? Two minutes. That was the last mission, and it was also the shortest. I was a little disappointed. Survival is fun, but it doesn't have any of the fun quotes like the zombie mode does. Plus, I can play with three other people instead of just one.