Guitar hero 3 was the one I played the most...so I'm going with that. Didn't RB3 have a "pro" mode with more "realistic" instruments?
In pro mode the drums have more cymbals, but you have to physically activate it. And I have seen a physical guitar that you can plug into an amp and use it in GH/RB, looks sick, just wish it was an actual Fender / Gibson...its a lame Squire.