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

Execution · Practiced Mastery
Capcom's futuristic arcade beat 'em up starring four heroes battling crime across Metro City.

Execution · Practiced Mastery
Simon Belmont's SNES remake-quest with a multidirectional whip and a moody trek to Dracula.
Captain Commando leans Execution (Practiced Mastery); Super Castlevania IV leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Captain Commando
Tight arcade brawling, dash attacks, throw timing
Super Castlevania IV
Eight-way whip control and stair commitment test precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Captain Commando
Fixed enemy formations and boss scripts
Super Castlevania IV
Classic scripted monster patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Captain Commando
Small item and spawn variance
Super Castlevania IV
Hidden wall meat, fixed locations
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Captain Commando
Stage routing and damage-efficient crowd handling
Super Castlevania IV
Subweapon choice and boss pattern study
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.