Speed: George Benson...speed with a purpose...
Technique: Gilber, Satch, Vai...there's tons of great technical players
Songwriting: really can't say...
Originality: Hendrix/Clapton, another hard category for me...
Heaviness: Angus,Iommi, many greats
Slide: Elmore James, Duane Allman
Blues: SRV
Overall: to many things to consider...everyone has there strengths and weaknesses