Is Bach "better" than Mozart?.... I mean.. really.. it's so subjective it's not funny... but it does beg the question, as turkeyjerky214 has already mentioned, "How do you define 'best'?"..

I was chatting on the Reaper IRC channel last night and someone suggested I have a listen to this guitarist called John McLaughlin.. personally I'd never heard of the guy.. but he is pretty amazing. He was part of the Mahavishnu Orchestra.. an experimental band from the 80's I think.. though they look like they are all hippies from the 70's.. :) Anyway.. the violinist in that band is simply amazing.. but the guitarist, John, is one of the best I have ever heard. I checked out some of his other stuff and the only thing I can think is the cause of him being relatively "unknown" is that he may possibly be too "classical" sounding to be considered "popular".

The point is.. you are always going to find these obscure "best of" people and songs that you never knew existed as you go through life. Even with a Masters Degree in Musicology or Musical History.. you still can't definitely prove one "artist" is better than another.. and certainly not "the best".. all you can do is give an opinion and back it up with facts and opinions of others.