Both CoD 4 and 5 were equal when it came to campaigns. The 360 had a slightly better graphics version but not noticeable.
It is the online part that really determines these games. CoD 4 and 5 both had much better online play on Xbox Live and I expect the same to be true of MW2. The reason is because on Xbox Live MS handles everything and it just works right in with MS's matchmaking system. On PSN Infinity Ward has to develop all that themselves and host any servers themselves. And I am speaking from experience with both PS3 and 360 versions of MW and WaW. The PS3 version was far laggier online and had more server/host disconnects.
So that would be the difference. If you have both consoles and value online play above all else, you should almost always get the 360 version, and I am willing to bet it will be the same with MW2 as well.







