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 · Pure Mechanics
A rally sim whose procedural stages keep variance alive while rewarding clean car control.
Diddy Kong Racing leans Execution (Practiced Mastery); DiRT 4 leans Execution (Pure Mechanics).
DiRT 4 leans a little harder on execution, though the gap is small.
Diddy Kong Racing
Drift boosts across car, hovercraft and plane demand precision.
DiRT 4
Procedural stages still demand consistent throttle and apex discipline
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.
DiRT 4
Time-attack structure has no adaptive opponent
DiRT 4 leans a little harder on variance, though the gap is small.
Diddy Kong Racing
Balloon pickups and items inject moderate randomness.
DiRT 4
Procedurally generated stages prevent full route memorisation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Vehicle choice, balloon upgrade routes and boss strategies converge.
DiRT 4
Car choice, setup and rally team progression are solvable systems
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.