Unfortunately, I'm crap at both. Yay uncoordination in GH! That is why I prefer play RB: they have drums. I can deal with finding the beat and following said beat. I often air drums while others play GH, cause I'm so crap at it... Don't judge me.
I do view real guitar very highly, though I can't play it. I wish I could learn, but I lack the money to. Damn capitalist societies... Ah well. I suppose that is a future goal. I borrowed my neighbour's guitar for one day and I was learning fairly quickly for a beginner, so I guess I will have to keep on lamenting my lack of guitar-playing-awesomeness. Though, for some reason, I always feel I may be better off playing bass...
All I can say is that the real thing will always remain cooler than the game.