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
Luchador metroidvania mixing brawler combos with demanding color-switch platforming.

Execution · Pure Mechanics
Course-corrected revision restoring difficulty to the trilogy's weakest entry.
Guacamelee! 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.
Guacamelee!
Combo brawling and dimension-swap platforming challenges
Ninja Gaiden 3: Razor's Edge
Steel-on-bone counters still demand sharp hands
Ninja Gaiden 3: Razor's Edge leans a little harder on reads, though the gap is small.
Guacamelee!
Enemies telegraph fixed patterns
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.
Guacamelee!
Authored world with no randomness
Ninja Gaiden 3: Razor's Edge
Deterministic encounters
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guacamelee!
Ability routing, combos, and secret hunting
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.