I'm getting BO2 and not Halo 4. I love the Halo series, I really do, but the MP drives me crazy with the BS like needing entire clips to drop an enemy, energy swords and shotguns ruling the field, etc.
Xbox gamertag: NekoEspirito NekoEspirito CoD MW3 AC: 0018-3623-8313
I have both, they are very different games so it just comes down to personal preference in the style of game you want. In terms of overall quality I would say Halo 4, but I enjoy both depending on what kind of mood I am in.
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If you can get both do so as zombies is always a blast, but if you have to go with one it's gotta be Halo 4. The campaign is amazing, and the multiplayer is infinitely more versatile. Fro Grifball to Big Team to SWAT, there's just so many different ways you can play that it really blows any CoD out of the water, in my opinion at least. The main thing Blops has going for it is Zombies, which is a pretty big plus. Some of my best memories from gaming were made in late night Zombies sesh's with my friends. But all in all, if you have to go with one, Halo 4.