Further to my comments above, one of the better reasons for a baritone guitar in a group is it gets a little more out of the sonic way of other instruments. One of my groups has guitar and bass, but only if I play them both, so the baritone lets me "get down". Many bands have too much jangling happening in the same range. That same group once tried to do a song with 12 string (standard tuned), cittern, mandolin, piano, and 3 vocals, only to discover the obvious...there was way too much happening in the same octave!

I have always believed that standard tuning is too high, though it is a good compromise set of pitches, and society is certainly used to hearing guitar in standard. With good strings and setup, guitars can offer a whole new world of timbre when tuned down.

Where the bari really shines is in a duo with flute or violin or voice. The extra range is very effective, particularly when one is looking for a low D (or lower) which just isn't available in standard tuning.

For what it's worth. Mooh.