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 3DS Kirby playing with foreground-background depth and the vacuum-everything Hypernova power.

Optimization · Practiced Mastery
Gentle two-character puzzle coordination through a scripted wartime fable.
Kirby: Triple Deluxe 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: Triple Deluxe
Easy main game, modest arena challenges
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: Triple Deluxe
Bosses follow fixed patterns
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: Triple Deluxe
Levels fully deterministic
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: Triple Deluxe
Sun-stone hunting and foreground-background gimmick puzzles
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.