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 bullet-grazing shmup testing precise dodging and scoring routes.
Cuphead leans Execution (Pure Mechanics); Psyvariar 3 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.
Psyvariar 3
Grazing bullets at the edge of death is pure twitch
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.
Psyvariar 3
Scripted bullet patterns, no adaptive opponent
Psyvariar 3 leans a little harder on variance, though the gap is small.
Cuphead
Minor attack-order shuffling between phases.
Psyvariar 3
Fixed patterns, memorizable once learned
Cuphead leans a little harder on optimization, though the gap is small.
Cuphead
Loadouts and boss phase order are fully learnable.
Psyvariar 3
Buzz-system scoring routes reward optimized play
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.