Tough call, as Nick said, you really need to do both. Martin Simpson has developed into a really great singer (in my opinion) and his song choice is wide ranging and exciting. Then there is the guitar playing which is exceptional and a real bonus. I haven't seen Whiz live for many years but I remember a very honest and engaging performer, more conventional than Simpson, but sometimes less is more and right for the songs. If it was really down to just one I guess I just go with Whiz because he is a rarer catch and Martin tours widely.

Chris