I'm building a baritone after playing one at a friend's, but I personally think it's more of a guitar than a bass (and I play the bass). both in how they feel and how they sound. I'm sure you can use the baritone for bass if you need to, just like you could use an octave down on a guitar.
On the other hand a duo with a guitar may be the perfect setting for the baritone, it will stand out better than in a band setting (where its range can get lost more easily than guitar and bass)
So try one and see what you like.
Fender Bass VI is another choice, feels more like a bass, but is tuned like a guitar, just an octave lower (the low string is E rather than B like a 5 string bass)