um idk, i say all of them cuz i love all the songs they have on each game. I play medium but now i have advance on hard....I advanced for 2 reasons...1.)to get better... and 2.) I luv doin the hammering.. Its really fun.
Dont forget that one game where its like 80's Rock...somthing like that...isnt that part of guitar hero? if not plz mistake me.
Guitar Hero: On Tour: TBD (Nintendo DS)[10] Guitar Hero: Aerosmith: June 2008[12][13](Wii, PS3, Xbox 360, and PS2) Untitled Guitar Hero Add-On: Spring 2008[36] Guitar Hero IV: Late 2008[8][9][37]
I think 3 is the best because I thought it had a better music selection. There is also alot more downoaded content. But what is even better is Rock Band.
Guitar Hero 2 all the way. 3 had the potential, but the designers screwed up the difficulty hard core. They changed the timing and all the Guitar Hero 3 controllers are worthless crud. In one of the pre launch videos one of the developers from Neversoft is quoted saying, "we made this to be impossible" I'm sorry but games should be designed to be fun, not impossible. 1 just doesn't have enough good songs.