When Clapton was asked this exact question he replied, Buddy Guy. I guess it would depend on the style of guitar you favored. Green was more of a Britist Blues guitarest and his best work can be heard on the original Fleetwood Mac material put out on the Blue Horizon label. Claption on the other hand played excellent rock blues that is portrayed by the Cream material. Either way, you will hear some of the best guitar work ever.
