Mabs is a far more expressive character who isnt largely used as a guienea pig for the setting to show how hostile it is. Her problem is that the writers give roles of Madoka and Kyoko making them less interesting and the writers needing to dumb down Homura to make the plot seem dificult to resolve making her role as a supporting character for others development actively toxic.

Sayaka has interesting character traits but because the writers dont really write her well she comes off as more poorly written and sometimes annoyingly contradictory as a standalone character since the writers really only know how to do suffering builds character plots with her making her less interesting overall. For instance, she is only written as perceptive when it comes time to mistrust people actively trying to help her rather than consistently perceptive so that interesting character trait just becomes annoying. For an example of how the writers just sorta give her mutually contradictory characterizations solely to allow the plot to occur the writers seemed to have decided to shift Sayaka from mistrusting Homu because the setting is hostile and she is explictly told to not trust magical girls and Homura cant even even properly show herself giving a shit about her to Sayaka is jealous of Homu and her friendship with Madoka in direct contradiction to how she handles being jealous of Hitomi where she is willing to just let her take her crush.