Personally I find the lower tone of the baritone more pleasing to my ear. I got a Morse ec baritone last year and like it a lot. Your not far away from the Button Box, take a ride up there some time and try them both out. There the same size and about the same weight.
I play contra dance music with a group of friends. The baritone helps separate the concertina from the violins. If I played treble it would be hard to hear myself play.
Aside from that I find the pitch of the baritone more pleasant, the down side is the bottom notes require more air, but you know this already.
Good luck. Jim