Green and Clapton were the first white Blues guitarists who broke into the scene and made a big contribution to the music of Blues in terms of popularizing it-- especially Clapton. But, although they are technically great, their phrasing and conveying raw emotions may not be up to par with the old legends. I think, beside the scale (pentatonic) and beat, Blues is all about raw emotions. I have not heard any white guitarists, including SRV, who can pour them out like black counterparts. Dynamics, vibrato, and delicate timing are critically different between them -- what a generalization. If you don't want to go back to Muddy Waters or T-Bone, you may want to try Red House by Hendrix. It differs greatly from Clapton's or SRV's.
