"I've never been able to see the point of a banjo-guitar (or whatever they call them!) other than as a chord-strummer that will cut through - but the resonator guitar does a better job anyway."
- Bernard.

I've found the 6-string banjo to be great for all sorts of stuff, particularly jug band music and old-time. As a chord strummer it's fine, but the most useful style for me has always been Travis picking with lots of rhythmic accents. Ragtime music sounds good on it too. I've used a resonator guitar in exactly the same ways, and that's more versatile, I'll admit.
In the 1920s some jazz men played the 6-string; the best-known was Johnny St. Cyr but there were others of note. It is not a hybrid instrument like the dulcijo. Why not give it a go?