Both phenomenal players, but different in their own. Jimmy Herrings got that technical aspect going on but still very jazzy at the same time. A very skilled showy guitarist, Jimmy pulls out some insanely complicated riffs. But as for blues and feel, Jimmy can't compete with Derek. Derek's slide playing and even fretted playing is so soulful and jazzy. Sounds like Aretha Franklin on guitar. Where Derek lacks in the technical and theoretical aspect of music, he makes up for it his soulful feel. My moneys on Derek. What does everyone else think?