head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, 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 boss-rush action game that is nothing but execution tests against scripted duelists.
Cuphead leans Execution (Pure Mechanics); Furi 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.
Furi
Parry timing, bullet dodging, and duel precision
Furi leans a little harder on reads, though the gap is small.
Cuphead
Bosses cycle scripted phases; no adaptation to player.
Furi
Bosses are scripted patterns, however adversarial they feel
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Cuphead
Minor attack-order shuffling between phases.
Furi
Fixed boss sequences
Cuphead leans a little harder on optimization, though the gap is small.
Cuphead
Loadouts and boss phase order are fully learnable.
Furi
Learning each boss's phases converges to mastery
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.