They are both compatible with each other. Using the GH drums with rockband, you're going to have to use the cymbals for one of the 4 RB colors (prob green). Using the rockband drums on GH:WT, both cymbals will probably be assigned to the green pad. I have RB2 (had to go with this one since I already have a ton of purchased songs for it) and think the new drums are way more solid and quiet than the RB1 drums. I guess it comes down to personal preference for you if you aren't already commited to one or the other.

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