Haven't yet heard the SACD version of "Folk Singer", but the best one so far is the DAD version on Classic Records, IMHO. Full enjoyment of this DAD can only work if your DVD player will pass a non-downconverted 24/96 digital signal. If so, the quality is stunning, as if Muddy and Otis Spann and the boys are right there in your listening room.
Sometimes makes me wonder why so many other SACD's and CD's sound so pale by comparison.