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
Sequel refining the fast rabbit platforming with co-op and multiplayer modes.
Execution · Practiced Mastery
Punk action game about an otaku assassin climbing a ranked killer leaderboard.
Jazz Jackrabbit 2 leans Execution (Practiced Mastery); No More Heroes 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.
Jazz Jackrabbit 2
Fast movement, ammo juggling, tight jumps
No More Heroes
Beam katana clashes and wrestling throws with motion timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Jazz Jackrabbit 2
Mainly scripted; light multiplayer modes existed
No More Heroes
Assassins are scripted boss fights
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Jazz Jackrabbit 2
Deterministic levels
No More Heroes
Deterministic encounters
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Jazz Jackrabbit 2
Weapon choice and secret routes
No More Heroes
Boss pattern learning and money grinding
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.