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 · Practiced Mastery
A memorization bullet-hell shooter testing reflexes against fixed enemy patterns.

Execution · Pure Mechanics
A run-and-gun boss rush about dodging scripted patterns with tight inputs.
1917: The Alien Invasion DX leans Execution (Practiced Mastery); Cuphead leans Execution (Pure Mechanics).
Cuphead leans a little harder on execution, though the gap is small.
1917: The Alien Invasion DX
Dodging dense bullet patterns at speed is the lead skill
Cuphead
Tight dodging and parry timing decide every boss.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
1917: The Alien Invasion DX
Enemies follow scripted waves, not adaptive behaviour
Cuphead
Bosses cycle scripted phases; no adaptation to player.
1917: The Alien Invasion DX leans a little harder on variance, though the gap is small.
1917: The Alien Invasion DX
Patterns hidden until memorized across runs
Cuphead
Minor attack-order shuffling between phases.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
1917: The Alien Invasion DX
Memorizing fixed bullet patterns and routing is core
Cuphead
Loadouts and boss phase order are fully learnable.
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.