head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Pure Mechanics
A run-and-gun boss rush about dodging scripted patterns with tight inputs.

Execution · Pure Mechanics
A vertical bullet-hell shmup testing dodging precision against scripted patterns.
Cuphead leans Execution (Pure Mechanics); Raiden V 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.
Cuphead
Tight dodging and parry timing decide every boss.
Raiden V
Dodging bullet patterns while shooting is the entire skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Cuphead
Bosses cycle scripted phases; no adaptation to player.
Raiden V
Enemies follow fixed scripted patterns, not adapting
Raiden V leans a little harder on variance, though the gap is small.
Cuphead
Minor attack-order shuffling between phases.
Raiden V
Patterns are memorizable, little true randomness
Cuphead leans a little harder on optimization, though the gap is small.
Cuphead
Loadouts and boss phase order are fully learnable.
Raiden V
Weapon selection and route learning is a meaningful 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.