Depends on the system. RB 2 has a cool feature - you can use any RB tracks you have - and import music into RB 2.
I too have all 3 games - and all 3 sets of mics, drums and guitars. I have GHWT on my PS3 - lol, Activision said the 360 was backordered and the PS3 version was available and could be shipped to me sooner, so I opted for that version so I could sell the wired RB1 equipment because the wireless does work with RB1 as well.
They are essentially the same. You need to look at tracks to consider which game to buy. Personally, I like have a huge library and RB keeps signing acts but mum is the word on GH signing more folks.







