I relate to the responses about individuals, like Tommy Emmanuel and Scotty Anderson. But in the spirit of the OP's more general question about genres of guitar pickers, for me it would be a toss up between bluegrass and jazz. For me, it's just simpler to assume that any guitar picker I happen to meet is better than me. Sometimes that's not true, but quite often it is. I can be intimidated to not break out my guitar or to put mine down in the presence of greatness. That said, while I can be intimidated by better pickers, I also get challenged by them. I may be intimidated enough to not want to play with them, but never so intimidated that I consider laying my guitar down permanently.