The higher end M bassoon was meant to be a mechanical equivalent to the Renard Artist bassoons. Moosmann has his own key stylings and ergonomics of course, and you may prefer one over the other. Same with the bore design and sound concept. You may prefer one over the other. The M bassoons play like Moosmann, the Renards like Fox bassoons (student to pro comparison in both cases).
Ultimately you should try both side by side with your teacher and make an informed decision after playing them!
M.M.A., D.M.A. University of Illinois at Urbana/Champaign: B.Mus. Lawrence University
Bassoon professor at University of Wisconsin Eau-Claire
Maker of the Little-Jake electric bassoon pickup and Weasel bassoon reeds