As a bastard child player, and a player of Bb saxes, I can tell you its a hard life out there in the sessions. Both are louder than other instruments, and slower than whistles. C-mel saxes dont sound as natural as the ones of other keys, as if they werent quite in tune you have to work very hard with the embouchure in the higher registers, but if you just happen to get a good one theyre great to play. My C-mel soprano was jumped on by a klezmer player at Sidmouth last year, and he really could wield it- all those laughing squeaking noises fit klezmer a treat, as does a c-clarinet which isnt quite such a bastard child tonally but is more difficult to play than a sax. I really would have liked to play oboe, but found them more difficult to blow. Whatever you end up with will be an exoerience for you!