head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
One-hit-death shmup execution through memorised alien-intestine stage patterns.

Execution · Pure Mechanics
A run-and-gun boss rush about dodging scripted patterns with tight inputs.
Abadox: The Deadly Inner War leans Execution (Pure Mechanics); Cuphead 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.
Abadox: The Deadly Inner War
One-hit deaths make every dodge a perfect-input demand
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.
Abadox: The Deadly Inner War
Enemy waves are fully scripted
Cuphead
Bosses cycle scripted phases; no adaptation to player.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Abadox: The Deadly Inner War
Stages replay identically once seen
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.
Abadox: The Deadly Inner War
Memorising spawns and checkpoint routes is mandatory
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.