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 · Pure Mechanics
Retro Studios' notoriously tough revival of Donkey Kong Country with relentless set-piece levels.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Donkey Kong Country Returns leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Donkey Kong Country Returns leans a little harder on execution, though the gap is small.
Donkey Kong Country Returns
Demanding rocket-barrel and mine-cart sections, strict timing
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country Returns
Scripted hazards, no adaptation
Super Mario World
Scripted Koopas adapt to nothing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country Returns
Hidden puzzle pieces, fixed once found
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Donkey Kong Country Returns leans a little harder on optimization, though the gap is small.
Donkey Kong Country Returns
KONG letters and time attack routes are learnable
Super Mario World
Secret exits and route knowledge add a modest solvable layer
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.