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
Cave's gothic horizontal bullet hell with player-chosen stage difficulty and item-chain scoring.

Execution · Pure Mechanics
Capcom's infamously punishing arcade platformer that makes you beat it twice for the real ending.
Deathsmiles leans Execution (Practiced Mastery); Ghosts 'n Goblins leans Execution (Pure Mechanics).
Ghosts 'n Goblins leans a little harder on execution, though the gap is small.
Deathsmiles
Horizontal bullet dodging with dual-direction shooting
Ghosts 'n Goblins
Committed jumps and pixel-precise throws, no mercy
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Deathsmiles
Scripted gothic enemies never adapt
Ghosts 'n Goblins
Enemy spawns are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Deathsmiles
Selectable difficulty fixes patterns, little randomness
Ghosts 'n Goblins
Red Arremer movement adds slight noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Deathsmiles
Item counter and rank route choices drive scoring
Ghosts 'n Goblins
Weapon choice and route memorisation are mandatory
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.