There really isnt a label as the BEST GUITARIST of ALL TIME, though you can label some of the best guitarists of all time well because there is alot of talent out there. For music there are the best, but they all have there style's and combinations that also make them unique and apart from others, so really I would say who are some of the best Guitarists of all time LOL.
thats honestly a very well thought out and executed point! props my friend...