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 · Pure Mechanics
Course-corrected revision restoring difficulty to the trilogy's weakest entry.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Ninja Gaiden 3: Razor's Edge leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Ninja Gaiden 3: Razor's Edge leans a little harder on execution, though the gap is small.
Ninja Gaiden 3: Razor's Edge
Steel-on-bone counters still demand sharp hands
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Ninja Gaiden 3: Razor's Edge leans a little harder on reads, though the gap is small.
Ninja Gaiden 3: Razor's Edge
Scripted enemy waves
Super Mario World
Scripted Koopas adapt to nothing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Ninja Gaiden 3: Razor's Edge
Deterministic encounters
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Ninja Gaiden 3: Razor's Edge leans a little harder on optimization, though the gap is small.
Ninja Gaiden 3: Razor's Edge
Simplified systems leave less to solve
Super Mario World
Secret exits and route knowledge add a modest solvable layer
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.