So this happened...

So I gathered about 80 orbs and summoned a BB!Tharja which is -hp/+res and im happy. But the next summon i did, well I got a -def/+Hp Ayra and im even more happier! I don't know what to do now as Ayra has a bad iv and I might fodder swift sparrow to tharja as she's an offensive unit, should i or not? Thanks!