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
A kart racer with an adventure structure and three vehicle types, lighter on item chaos than its rivals.

Execution · Practiced Mastery
Cartoon kart racing where lines and shortcuts beat the gimmick weapons.
Diddy Kong Racing leans Execution (Practiced Mastery); Wacky Races leans Execution (Practiced Mastery).
Diddy Kong Racing leans a little harder on execution, though the gap is small.
Diddy Kong Racing
Drift boosts across car, hovercraft and plane demand precision.
Wacky Races
Kart handling and drift lines decide finishing position
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Multiplayer item duels add mild prediction; AI is scripted.
Wacky Races
AI racers rubber-band by script, not by reading you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Balloon pickups and items inject moderate randomness.
Wacky Races
Item-style dirty tricks inject mid-race chaos
Diddy Kong Racing leans a little harder on optimization, though the gap is small.
Diddy Kong Racing
Vehicle choice, balloon upgrade routes and boss strategies converge.
Wacky Races
Track shortcuts and character stats reward study
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.