User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-26917552-20160126050230/@comment-96.4.165.157-20160126171726

Lucina. She has more buffs than Berdette. The buffs that Berdette has that Lucina doesn't is a better defensive convert and defense ignore. Defense ignore is not that big. Lucina comes with elements and currently the best heal over time in the game. As sub unit, Lucina literally smashes her. The defensive convert is weak on Lucina, but it's forgivable when you factor in Lucina's other buffs. The leader skills are debateable. It depends on what you have and need. Berdette is good for trial, GGC, and GQ while Lucina's is great everywhere as long as the element requirement is met. (That's it''s only problem.) Though if you already have elements and a heal over time in your squad, then Berdette would be better.

So really it's up to the squad and person. (Though through a direct comparison, Lucina wins no matter how you look at it.)