I think that it might be better to go with the -Res bane and focus on making her a more physical tank than a mixed one, unless your team lacks a Dragon check.
I don't know about lowering her Def just so that her Def/Res are about even. 26 Def / 25 Res un-merged and un-buffed aren't very good if you want to make her a mixed tank. Plus, that lowers the damage output of her default Bonfire. You also mention that you have a Res tank in the form of Genny. If you think that she does an adequate job by herself, then you could probably get away with -Res.
One thing to note is that she will not be able to tank dragons well with the -Res, and Genny won't be helping you there due to how the refined Breath weapons work. If you don't have a good Dragon check on your team (either a melee unit with high Res or a ranged unit with good mixed bulk with Close Counter), then L!Robin might be better off with the -Def, though 25 Res still isn't very good at checking Dragons.
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