Catria refine

So I'm glad my +10 Catria finally got a prf. And the refine effect is good, however, my current arena core is Ares (+6), Catria (+10), and Micaiah (+8). So it doesn't really help sadly. I mean I have +10 H!Mia that I think about using but even then that's still only 1 other fliers, and I have no intentions to +10 anyone other than Ares or Micaiah (if she returns as a focus) anytime soon.

It feels bad but I'm really tempted to refine for +def (would have 37 def, boosted to 49 with double CD), which feels bad since her weapon effect is cool?