Cannot speak to the b17 vs mente. My road bike's geometry is fairly relaxed, i'v had both a books team pro Ti and berthoud Aravis mounted on it. Team pro is comfortable and nicely broken in, the Aravis is a lot newer (not yet really broken in). They are similar, with Aravis saddle nose being slightly wider and flatter than team pro. Aravis saddle rails are slightly longer. Aravis leather was stiffer than anticipated from various advertising blurbs, seems like it is starting to break in more quickly than the team pro did. Got the Aravis because i was curious to try a different saddle - Both saddles are quite comfortable for me (do need more time on the Aravis).