Jodeci >> BIIM in the black community...well the black community that was 25/30 and under during their runs. No one would argue that BIIM wasnt the bigger act, they had a broader audience with white folks and people my parent's age who saw them as a continuation of the soul groups they grew up with. My parents weren't listening to no damn jodeci, but they and my aunt owned them BIIM albums. Kids also had BIIM albums, but you'd be hard pressed to find a parent buying jodeci for their 8 year old daughter.
You can't take pure sales when it comes to measuring love and impact on the black community. Toni Braxton was a huge star in the 90's but you wouldn't look twice at someone saying MJB matters more/has more love in the black community specifically (tho both, like both groups have a big black fanbase)