Re: inflatable vs. hard-shell vs. ??
I have a couple of buddies that come up each spring from NC and they bring a large inflatable for 3 anglers. Not sure of the model, but one is a guide down there and that is their boat of choice. They do just fine, so I don't know why the fiberglass boat rules on that water. I'm guessing more tradition than functionality. As you mentioned, they're a lot lighter and you won't be in any serious white water.
Wild rivers are earth's renegades, defying gravity, dancing to their own tunes, resisting the authority of humans, always chipping away, and eventually always winning. — Richard Bangs & Christian Kallen, River Gods