I've never really got into the whole "this guy is the best guitarist ever" thing. I don't know what I would base it on anyway, other than who I liked. I don't really have a favorite. For that matter, I don't have one favorite band or vocalist either. I did when I was a teenager, but I like a much wider variety now. There are a lot of really good guitarists, but I can't pick one as a favorite and definitely can't say "this guy is the best".