Tamar and Toni are probably the most LEVELED duo with Toni giving a 60% and Tamar a 40% slay Both of their catalogs are just that GEWD.
Brandy carries her team entirely by herself, but her 95% is stronger than all the other gurs. Ray J is overall the weakest link (with Solange tbh), but he has some cute bops.
Beyoncé has some iconic bops, and Solange has a few nice songs too. 80%/20%.
MJ and Tran can really go. I love HIStory and what not, and Tran can dance and coo, but yeah... toss their mess!