I havent played Rock Band.. but I'm halfway into expert mode/fully thru hard mode on all three GH's.
Soo.. I'd like to say that GH is the best, but I wouldnt want to speak out of ignorance. I'm always looking for a new challenge.
P.S. DJ MAX PORTABLE MUST DIE! Fucking hell I hate that game. It's not easy on easy.. it's not possible on medium. I'd have to snort a dozen lines just to get thru a song without missing a dozen beats.
With that said.. no, I'm not plunking down any cash for such an unforgiving game. Let the koreans keep their damned game and try to one-up each other in the damned songs. I wouldnt download it with YOUR broadband connection.