Linde or Delthea?

It really matters what sort of team you plan to put them on. If you go for Linde's new refinement then have her with another powerful mage to make use of her refinement. Otherwise Delthea's tome is better with a team with physical units. Really up to what your team comp is usually like.

It really matters what sort of team you plan to put them on. If you go for Linde's new refinement then have her with another powerful mage to make use of her refinement. Otherwise Delthea's tome is better with a team with physical units. Really up to what your team comp is usually like.

Depends on the team. To utilize Linde to the max with her new Aura tome, you need another magic user on the team. Delthea is more suited for physical teammates. But then again, Linde can get Dark Aura and their stats are pretty much the same anyway, so I'd say Linde is better for both types of teams, since she can get everything Delthea has anyway.

I think with these IVs both are pretty similar in their possible uses but their times make a difference. Delthea is generally a bit slower but her attack is amazing, Linde is faster but hits a bit less hard. If I were you, I'd use Linde as a mage support with the new refine, a bladetome unit or as a pseudo healer with standard Aura tome. She's pretty good but in general because of her defenses, she needs support herself to be completely reliable.
Delthea on the other hand, especially with +Speed, is really nice in melee teams because of Dark Aura and can also take some hits from mages so she's a bit better at sustainability.
If you have the resources, build both, they're great in their own way just because of the differences in their resistance and tome effects.

Linde and Delthea are both fantastic units and you could use either one. Their stats are very similar and fill the same role of blue magic nuke with a side of buffs.

Personally, I use Linde on my main team with Dark Aura simply because she has more merges and all three of the Deltheas I've pulled since her release have been either -atk or -spd. (I also inherited Drive Atk onto her from one of said Delthea, so my Linde is pretty much Delthea with hair extensions lmao.)

Linde, with her new refine, now has significantly more options available to her than Delthea, so if you want a more versatile unit, Linde may be for you.

Both are great units and can work well in the same team comps. Now Linde is trying to carve out a different niche for herself as a mage buffer, but she can still effectively drive Delthea out of her own.

Basically, use whichever you like better. Unless you want a mage-focused team comp. Then use Linde.

Edit: Also, there's only 1 point of difference in their neutral attack stats and 2 in speed. Your Linde only has 1 less speed than your Delthea and 2 more attack. I'd go with your Linde.