Which Fae is better :/

I'm personally building a +def -Hp one myself with the idea of making her a mixed tank. Her Res and Def are within one point of each other, sitting at a solid 29 and 30 before buffs and skills. HP is honestly her best bane because she still has so much of it, and when you refine her breath, you get +5 HP, no matter how you refine it.

Personally, I would either refine it for Def or for Speed. If speed is not her boon, then speed is probably the better choice, but it's really better not to take a shot to her Def. If you had +spd, -HP, I would recommend that.

Another vote for +Def/-HP from me, I personally think it’s a great IV for a defensive tank like Fae as it gives her 4 stats for the boon and improves her physical matchups, namely Brave Lyn.

However, with the weapon refinement, +Atk or +Spd / -HP seems more versatile and flexible than +Def nowadays, but it’s still a good IV nonetheless. As for the +Spd/-Def, I definitely don’t think her Defence should be messed with unless you need her to exclusively tank magic damage.

I think speed is a waste on Fae. If you make her into the tank she can be, she will take little damage, even from secondary hits. Whereas she will never be fast enough to avoid doubles from things she would want to avoid doubles from (like red swords, she just needs to avoid them).

My +Def-HP Summoner support, refined LB Fae has 38 Defense and 36 Resistance, without seal.

+def -hp all the way. I've got one I built for extreme tanking, both physical and magical, and she is r i d i c u l o u s.