Xbox Games On Demand: MW3 or Black Ops?

I'm looking to buy either MW3 or BO on demand on Xbox as my mum won't let me play them and I know they are really expensive, so im only going to get 1. I will also get BO2 on demand in april when it comes out for on demand users. I play a lot of multiplayer, and don't care about the single player as I... show more I'm looking to buy either MW3 or BO on demand on Xbox as my mum won't let me play them and I know they are really expensive, so im only going to get 1. I will also get BO2 on demand in april when it comes out for on demand users. I play a lot of multiplayer, and don't care about the single player as I wont play it. Which one should I get? (MW3 has more bullshit like Type 95/FMG9 Akimbo isn't a reason as I don't see that as a problem)

Thanks
Update: I play a bit of zombies but im not an avid fan if that helps.
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