Nejire is also a bit of a glass cannon, as her durability sits at 237.32 Tons of TNT. Meaning Yumi's attacks will hit harder on Nejire than her own attacks on Yumi.
Yumi's advantage are combat skill as Nejire has zero showings in close combat, higher durability, can change the battlefield to a more favorable location for herself, can increase her power and speed with Frantic Mode, boost her power even further with Ice Queen, and uses ice attacks that can slash/cut/pierce.
Considering Nejire's durability is over 2x less than Yumi's AP, if given the chance she can easily slice through her body.
Nejire's advantages are her superior air mobility with true flight, overall higher AP, superior range, higher Lifting Strength, and likely longer lasting stamina as well. Nejire is able to fight against a villain for over 20 minutes while he was absorbing her vitality and her own Quirk uses her vitality as well.
Although, I don't see the fight lasting that long. While Nejire's flight is superior and she has higher range, Yumi's ability to jump high and dash through the air means she can always reach her. Nejire's range isn't high enough to attack outside of Yumi's air range.
However, I'm voting for Nejire here. Her victory condition is more likely to happen, since she'll be trying to restrain with her Quirk. If Nejire grabs Yumi with her Wave Motion, she shouldn't have anyway of escape that hold. Meaning she can inflict damage for as long as she wants.
Yumi is very nimble I admit, so she isn't going to be catching her easily. With Frantic Mode making her speed higher would complicate that as well, although she be sacrificing her own durability. I feel Nejire's ranged options are more viable over all and she can easily keep her distance while attacking at the same time.
She also has control over her own attacks, making it harder for Yumi to avoid them as they'll be redirected to her. Both Yumi and Nejire only need the other person to make a single mistake, one slip up and a single attack or grab will end this fight. I just think Nejire catching Yumi is more likely.
