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
Punk action game about an otaku assassin climbing a ranked killer leaderboard.

Execution · Practiced Mastery
A retro-styled action platformer with pogo-stick combat.
No More Heroes leans Execution (Practiced Mastery); Shovel Knight 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.
No More Heroes
Beam katana clashes and wrestling throws with motion timing
Shovel Knight
Pogo combat and platforming need timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
No More Heroes
Assassins are scripted boss fights
Shovel Knight
Scripted boss patterns, not reads
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
No More Heroes
Deterministic encounters
Shovel Knight
Deterministic stages
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
No More Heroes
Boss pattern learning and money grinding
Shovel Knight
Relic and upgrade choices shape runs
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.