User blog comment:Drkdragonz66/Modern Warfare 3 interview: Robert Bowling talks about Spec Ops Survival/@comment-173.169.251.242-20110813010049/@comment-216.211.118.218-20110815170051

IMO Spec ops ha more variety involved while zombies you do the same thing over and over..... and over again. It gets boring. Spec ops gives you more to do and it has a better replay value.