head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, 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 pure physical-execution trainer - playing a real guitar accurately on time.
Getting Over It with Bennett Foddy leans Execution (Pure Mechanics); Rocksmith 2014 leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Getting Over It with Bennett Foddy
Every inch climbed is precise hammer micro-control
Rocksmith 2014
Real fretting and picking accuracy is literally the whole game
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
Rocksmith 2014
No opponent, only the song
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Getting Over It with Bennett Foddy
Fully deterministic physics and terrain
Rocksmith 2014
Charts are fully known in advance
Getting Over It with Bennett Foddy leans a little harder on optimization, though the gap is small.
Getting Over It with Bennett Foddy
Route knowledge helps but cannot replace hands
Rocksmith 2014
Practice scheduling helps but solves nothing for your hands
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.