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
Infamous climbing game where one slip of the hammer undoes hours of progress.

Execution · Pure Mechanics
A classic 2D Mario platformer rewarding tight jump execution above all.
Getting Over It with Bennett Foddy leans Execution (Pure Mechanics); New Super Mario Bros. U Deluxe leans Execution (Pure Mechanics).
Getting Over It with Bennett Foddy leans a little harder on execution, though the gap is small.
Getting Over It with Bennett Foddy
Every inch climbed is precise hammer micro-control
New Super Mario Bros. U Deluxe
precise jump and platforming execution
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Getting Over It with Bennett Foddy
The mountain never adapts
New Super Mario Bros. U Deluxe
fixed enemy patterns, no adaptation
New Super Mario Bros. U Deluxe leans a little harder on variance, though the gap is small.
Getting Over It with Bennett Foddy
Fully deterministic physics and terrain
New Super Mario Bros. U Deluxe
minor enemy placement randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Getting Over It with Bennett Foddy
Route knowledge helps but cannot replace hands
New Super Mario Bros. U Deluxe
level routing for speed/collectibles
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.