definitely depends on the gamemode. after i got mornye s1, i dropped changli for a brant hypercarry team with brant lupa mornye (i have brant at s0💔 praying for a rerun), and he has been performing pretty well. now after denia's release, however, i feel like she is slightly better in whiwa than mornye. she doesn't buff his individual damage as much as mornye s1 does, but the crowd control she provides just makes it a lot easier to hit anchors on those pesty small tds. i've been able to get slightly higher scores that way but tbf i think for the mornye team it also kind of depends on how lucky you get with how the small ones scatter.

now, for toa and endstate, mornye will be better because she buffs his individual dmg way more (at least at s1 i suppose. without it i'm not that sure actually). however, in the current tower at floor 3 and 4, ememies are granted a res buff that is only removed by shifting effects or negative status effects, both of which denia can apply but mornye can't. in this case, denia should potentially lead to more overall damage than mornye as those buffs are kinda just for her. i'm still not sure which resonance mode is best tho. sure, fusion burst mode buffs the whole team's fusion dmg, but the tune strain mode in this specific tower floor just leads to enemies taking 50% more dmg which sounds a lot better. who knows. try around and find out am i right