Well the new community update is up and they talk about how many people decided to side with the Tieflings over Minthara.
Good does out weight the Bad but not entirely because of our Morals Larian.
Yes I agree. On one of my playthroughs, I made a save at the gate and decided to side with Minthara in one instance and side with the Tieflings in the other.
It's much more rewarding to side with tieflings at the moment, for example related to your relationship with Shadowheart with whom you get a romance option only on the good path. And as well, it didn't help, but Minthara was bugged. I couldn't interact with her inside the grove.