Rock Band 2 
Guitar Hero: World Tour Overall Comparison Gotta' say that due to sheer amount of songs, RB2 will pwn GH:WT. That being said, however, GH:WT does have the much-anticipated song-creator, so we'll see how that goes.
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all games are not created equal
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CommandantCommandant Level 9
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I agree (for now), I am a fan of both franchises, and even started on GH. But the monster that is Rock Band 2 just seems to own the music genre. The seemingly endless songs, and classic fun gameplay. Not to rule out GH:WT, I even hope it ends up doing well, but I still gotta give this one to Rock Band 2 (this is before playing GH:WT, so if i change my views ill apologize).
i am too, both are great for different reasons. I haven't picked up the GH:WT bundle yet, which now I'm holding off on because of the drum issues (the whole point of getting that bundle was so i'd have "better drums" than with RB lol)... GH:WT has a great set list, but... RB2/ will have over 500 songs by the end of this year. Yeah. For now, RB2 takes the win.