obviously , the higher the rarity , the stronger the unit tends to be. Ellet seems to become a better consistent healer post AW and SAW with her skill cutting her defense for increased attack and range (1.3x attack and 3x range).

Sera gets an increase in the activation chance (from 10 to 50% during skill usage) of her aw passive (mithirl arms) , which is pretty powerful on its own and can heal all allies on proc.



Honestly , i dunno. I'd probably go with sera because she's tankier and she doesnt gimp herself to become a better healer , but dunno...ellet might be more usefull at times