There are also a lot of aspects to consider. What exactly defines "best"? Is it their technicality? Is it their songwriting ability where they are able to pump out hit after hit? Or was it their innovation? Where they did something so completely new and different, they created their own style. Or better yet, created a whole new genre.
I suppose one might argue that the "best" guitarist was one that excelled in all those aspects.
Personally for me, I love all my favorite musicians equally :). One is not better than the other because one may be more technical, yet the other is a better songwriter, etc etc.
