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

Optimization · Practiced Mastery
A four-player Wii Kirby romp gathering ship parts for the stranded alien Magolor.

Optimization · Practiced Mastery
Gentle two-character puzzle coordination through a scripted wartime fable.
Kirby's Return to Dream Land leans Optimization (Practiced Mastery); My Memory of Us leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Easygoing main game; EX mode adds modest demands
My Memory of Us
Light stealth and platforming with forgiving timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Bosses are pattern-scripted
My Memory of Us
Patrols are fixed clockwork, never adapting
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Energy sphere hiding spots are static secrets
My Memory of Us
Everything is hand-placed and identical across runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Super ability timing and sphere collection are solvable
My Memory of Us
Coordinating the duo's abilities solves each puzzle room
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.