off top of my head, as far as a band, and a actual band not just a group of singers. I can think of Tony Toni Tone.
they are the first ones i can think of, off the bat who sold more and who I imagine overshadowed them in the 90s
Funny you mentioned Tony! Toni! Tone! because I started to mention them.
Going back and listening to their catalogue with an older more mature ear now they were dropping some heat too before Raphael decided to branch off and do his solo thing.
Even they were underrated for the time imo.
That Sons of Soul album was a straight classic to me, really hardly any skippable tracks and would probably be competing for a Grammy in a different era.

