Area design is no way near as good. The interconnected worlds of Dark Souls and Bloodborne shit all over Nioh's level design. Having to play a character instead of creating your own is a massive negative as well. The weapons may individually have more moves than dark souls weapons, but they're no way near as complex as the trick weapons system in Bloodborne.It's combat is far superior and the weapons are more fun. NiOh is like the step Mom that comes in when your parents get divorced. Even if her cooking is better and she's nice to you, you like your mom more just because.
Bloodborne trumps it's combat and the first dark souls trumps it in area design, atmosphere, story, characters and has better and more memorable bosses.. So yeah Nioh being GOAT is laughable.