I say Treyarch because they know how to balance multiplayer, also

riding a motorcycle while shooting a model 1887> riding a snowmobile while shooting a g18

zombies>spec ops

Hmm well I still think Modern Warfare 1 is better than the two...but I have yet to get into Black ops. 

Infinity Ward no likey the Wii :(

So I would have to pick Treyarch, they likey the Wii mucho!

COD4 can be classed as one of the best shooters 

So Infinity ward back in 2007

2009 lose there way, 2010 Leads and founders left so who knows who Activison put in charge 

I like them both but I think Infinity Ward is more talented (or was I don't know anymore because of all the things that happened over there).

COD4

Definitely going with Treyarch on this one. 

I lost all respect for Infinity Ward after their debacle with Activision this year.  Most people will blame that mess on Activision, but insiders will tell you that much of the blame belongs to Infinity Ward. 

Black Ops is a better game than MW2 and it nearly equals MW1.  I think Treyarch has come of age as a developer. 

treyarch always because infinity ward got full of themselves after cod4 and ruined mw2

Pretty much this.