Speed: Micheal angelo and John Petrucci
Technicality: Randy Rhoads.
Songwriting: Randy Rhoads. woah. Mr.Crowley.The whole blizzard of ozz album
Originality: Don't know
Heaviness: Dream Theater
Slide: Don't know
Blues: SRV
Overall: Randy Rhoads, because he was the one to bring Neo-classical to metal, not Yngwie malmsteen. Randy Rhoads was the spark for ozzy and he had Amazing technique, speed as well, more of a sheer speed then shredding and he was just plain out amazing.