For me the best blues guitarist ever is Green - and the voice to go with it...this is what I've always answered anyone who ever asked me the general quiz 'Who in your opinion is the best blues artist ever'...I know it's odd - I've been playing guitar for almost 40 years (since I was 6 yo) and my current guitar is a copy of Clapton's psychedelic SG from his Cream days (so, a BIG fan!)...SRV and the likes don't do it for me, sorry...even though BB King is absolutely fantastic and Robert Johnson CERTAINLY demands a honorable mention! (don't hate) and have a FANTASTIC weekend!