Robert johnson vs. eric clapton who do you think is the better blues artist?

robert johnson
http://www.youtube.com/watch?v=O8hqGu-leFc&feature=player_detailpage

eric clapton
http://www.youtube.com/watch?feature=player_detailpage&v=fC04ZZploBE
Update: BQ:roberts crossroads vs. creams crossroads?
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