Let's review. Both are likely to not be promoted (in my opinion they're better off being in their initial class) and Yumina's only real loss against her is the WLv growth and the chapter lead. Yumina makes up for it by having Rescue earlier than Marisa has Hammerne. Marisa gets Thief Staff earlier than Yumina gets Ohm; however, you have... get this, 5 Ohm Staff uses. That practically allows us to be a little more reckless with our team.
In short: both have unique staff utilities. So what suddenly makes Marisa a tier better than Yumina?
In short: both have unique staff utilities. So what suddenly makes Marisa a tier better than Yumina?