I can only agree with Conquest gameplay and maybe prettier graphics, because 3H is kinda shallow in that department.
Other than that, I find 3H superior in every way for reasons other people already explained better than I could.
I'm noticing we're entering a phase in which it's cool to criticize 3H, and that's okay if you didn't like it, but baity titles like this... I don't know. Fates was criticized by everyone as soon as launch because its flaws were evident, this didn't happen with 3H because while it has its flaws too they're not as messy as Fates's. To suddenly say "Fates was actually good" after years of criticism looks like a mixture of based nostalgia for the 3DS era and claiming something controversial just for the sake of it.
Just my opinion, of course.