The greatest guitarist of all time.... wow..... Probably one of the hardest question I've had to answer... I feel like Randy Rhoads could've easily been the best and then some if he had lived. But.. he wasn't the most technical guitarist out there. I think that buckethead, MAB or Malmsteen have the most technicality out there right now. I would probably say that my favorite guitarist would be Brian May, becasue Queen is the greatest band of all time IMO.