head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
The divisive middle Souls game, slower and stat-heavier than its siblings.

Execution · Practiced Mastery
A stance-action RPG carried by ki-pulse timing and loot build optimization.
Dark Souls II leans Execution (Practiced Mastery); Nioh leans Execution (Practiced Mastery).
Nioh leans a little harder on execution, though the gap is small.
Dark Souls II
stamina and adaptability-gated dodge timing
Nioh
Stance and ki-pulse timing demand inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls II
invasions add rare human mind games
Nioh
Scripted enemies
Nioh leans a little harder on variance, though the gap is small.
Dark Souls II
fixed world, known after one trip
Nioh
Loot affix rolls
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls II
builds and boss patterns reward study
Nioh
Build crafting and stance routing reward planning
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.