Which one?

Unless you love Ayra give it to Blyn. Ayra is a new breed of hero with great stats but I mean shes stupidly over-hyped. I still consider Ryoma to be a better red sword tbh. She just doesn't change anything. She's a stagnant red sword unit that still has to run at the enemy and shit to get her damage off. She's just like a Karel with moonbow QP honestly. I consider her on Karels level tbh Which isnt to say shes bad but I really just find her less useful and I'm not going to sit there and babysit her as a unit to make sure she works.

Ayra is really really good, but I think that having her as your summoner support won’t increase her matchups that much. Just give her phantom speed or speed+3 so she can proc her special and she will be top tier. On the other hand, Lyn will hold her own better with S support when outside of horse emblem, and will be deadly when in horse emblem.