head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Practiced Mastery
An easygoing co-op Kirby about recruiting enemies as friends and combining their elemental powers.

Execution · Light / Casual
Cheerful physics platformer about a kicking blob toppling a capitalist conspiracy.
Kirby Star Allies leans Optimization (Practiced Mastery); Pikuniku leans Execution (Light / Casual).
Pikuniku leans a little harder on execution, though the gap is small.
Kirby Star Allies
Very low difficulty, AI allies carry fights
Pikuniku
Floppy kicks and hops, gently imprecise
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby Star Allies
Friend AI helps rather than opposes
Pikuniku
No adversary anywhere
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby Star Allies
Fixed layouts and bosses
Pikuniku
Short authored world with few surprises
Kirby Star Allies leans a little harder on optimization, though the gap is small.
Kirby Star Allies
Friend-ability element combos solve puzzles
Pikuniku
Simple puzzles with obvious solutions
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.