I suppose comfort level might have lots to do with anatomy. My guess is "flatties" might like the padded bench seat a bit more  ;D.

As far as power on the stroke goes.......interesting thoughts. I like what DB had to say about foot braces. On the Expedition canoe I had foot controlled rudder which certainly acted like a foot brace. Instead of a decline of power with the Tractor seat I felt whole lots stronger without any back issues. Mucho better and I intent to reconfigure my other solo likewise. Probably the trick would be to try one out for a week or two and then decide.