I'd say GH3. There are 48 songs plus bonus tracks and 4 different difficulties to play on. They have added a co-op career which you can play online as well as battle modes to challenge other players. The songs are awesome and the replay value is high.
Although I haven't played COD4 yet, I have to say I am extremely sick of FPS and if I want to play a good FPS I will play HL2 or CS. Think of the replay value if you are going to drop the cash, I think that GH3 has a lot more of it.
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