After having a few days with the ps3 now i can safely say that..... wow, the ps3 got shafted on the ps3 port.
I would like to take a wild stab in the dark here and say that for every cod, the cleaners have been responsible for porting it to the ps3 after the devs go home.
Game plays with no fluidity at all, on the plus side, the ps3 community is a million times better than the xbox community.
Using mw2 as a benchmark it soon becomes clear which console has the biggest number of assholes.
Xbox usually takes me 2 hours to get 2 good lobby's at best, game is full to the brim of tubers and quickscopers.
Last night i had 2 hours on the xbox and left every single game.
So far, while i have been tubed on the ps3 i find it no where near as bad as the xbox, and when you find you do get tubed it's not normally a danger close oma homo.
In short, Xbox is the better console for playing cod on without a doubt, ps3 is the better console if you actually want to enjoy playing cod.