Nioh might have a deeper combat system, but it lacks variety in enemies or locations. It's an entertaining game, but I would rather play Dark Souls 3 every time.
Oh, and while the combat is more "complicated," half of the extra moves one can learn are useless. The game wants to be more like Ninja Gaiden or Bayonetta, but if one blocks, dodges, and attacks when they are supposed to, there is no reason to even bother memorizing special moves.