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
Souls-flavored action-adventure where Fury whips through the Seven Deadly Sins on a ruined Earth.

Execution · Pure Mechanics
Course-corrected revision restoring difficulty to the trilogy's weakest entry.
Darksiders III leans Execution (Practiced Mastery); Ninja Gaiden 3: Razor's Edge leans Execution (Pure Mechanics).
Ninja Gaiden 3: Razor's Edge leans a little harder on execution, though the gap is small.
Darksiders III
Souls-style dodge timing with punishing windows carries fights
Ninja Gaiden 3: Razor's Edge
Steel-on-bone counters still demand sharp hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders III
Sin bosses are pattern sets, not adaptive minds
Ninja Gaiden 3: Razor's Edge
Scripted enemy waves
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders III
Hidden upgrades matter once; world is fixed
Ninja Gaiden 3: Razor's Edge
Deterministic encounters
Darksiders III leans a little harder on optimization, though the gap is small.
Darksiders III
Hollow swapping, upgrade routing, and moveset study pay off
Ninja Gaiden 3: Razor's Edge
Simplified systems leave less to solve
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.