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.

Execution · Practiced Mastery
The fan-favourite sequel with harder levels and deeper secrets.

Execution · Pure Mechanics
A more combat-forward sequel with sharper platforming demands.
Donkey Kong Country 2: Diddy's Kong Quest leans Execution (Practiced Mastery); Ori and the Will of the Wisps leans Execution (Pure Mechanics).
Ori and the Will of the Wisps leans a little harder on execution, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Demanding jump chains and animal-buddy control
Ori and the Will of the Wisps
Combat plus escape chases demand tight inputs
Ori and the Will of the Wisps leans a little harder on reads, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Fixed enemy patterns, no adaptation
Ori and the Will of the Wisps
Scripted bosses, no human opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country 2: Diddy's Kong Quest
Secret Lost World entrances hidden until found
Ori and the Will of the Wisps
Deterministic encounters
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country 2: Diddy's Kong Quest
Routes, DK coins, and bonuses fully mappable
Ori and the Will of the Wisps
Shard loadouts and weapon choice tune playstyle
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.
full breakdown
Donkey Kong Country 2: Diddy's Kong Quest →
full breakdown
Ori and the Will of the Wisps →