Legendary banner gave me another L!Robin that could replace my former robin that has +SPD/-DEF. The new one has +RES/-ATK. Both have bad banes but DEF is a super bane. On the other hand SPD might be a better boon than RES... could you help me with my pro and con list? I lean toward the +RES one because the -DEF one couldn't stand that much fights yet
For me personally, I see the +spd,-def as better. +spd allows her to be better off both as a player phase and enemy phase unit. Also, if you plan on keeping her dragonskin, she still hits 30 def, which is average, and if physical units are a big threat to her still, then just give her the close def seal
Mine is +RES/-DEF (sort of a hybrid of yours). I'd go with +SPD/-DEF, no doubt. 38 speed is decent to avoid many follow ups and while the superbane hits her, in my opinion losing ATK is far much worse since she'll almost never benefits from a triangle advantage and a natural 45 isn't really stellar. If you have means to increase her speed in game, I'd use her as a mage/archer killer since she has DC in her weapon and hits the lowest from enemy def/res.
+RES/-ATK has only the advantage to make her more tanky, but imho she's definitely not the best dragon for that.
I also got a +Res/-Atk from this banner. I use her mainly to bait archers and mages for my Flier Emblem and she does it with aplomb. Fortify fliers help her defenses reach above average levels and her attack never really feels lacking since she doubles anything anyways with Quick Riposte. Her good base speed also means she won't get doubled by a lot of things, flier support only helps that further. So I think the IV's depend on how your playstyle is, if you want a defensive build go with +Res/-Atk but for offensive a +Spd/-Def would be better.
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