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

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

Execution · Practiced Mastery
Executing memorised high-speed routes through deterministic platforming levels.
Donkey Kong Country 2: Diddy's Kong Quest leans Execution (Practiced Mastery); Sonic Generations leans Execution (Practiced Mastery).
Same score on execution - 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
Demanding jump chains and animal-buddy control
Sonic Generations
Holding speed through precise jumps and boosts is the test
Same score on reads - 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
Fixed enemy patterns, no adaptation
Sonic Generations
No opponent; bosses are fixed patterns
Donkey Kong Country 2: Diddy's Kong Quest leans a little harder on variance, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Secret Lost World entrances hidden until found
Sonic Generations
Levels are fully deterministic
Sonic Generations leans a little harder on optimization, though the gap is small.
Donkey Kong Country 2: Diddy's Kong Quest
Routes, DK coins, and bonuses fully mappable
Sonic Generations
S-ranks come from memorising optimal routes and shortcuts
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.