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 · Pure Mechanics
Throttle and counter-steer precision on loose surfaces against the clock.

Execution · Pure Mechanics
A light-gun shooter testing aim while protecting a moving medic.
Colin McRae: Dirt leans Execution (Pure Mechanics); Rescue Mission leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt
Car control on loose surfaces is the entire test
Rescue Mission
Light-gun aiming accuracy is the entire game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt
Racing the clock or AI lines, nothing adapts
Rescue Mission
Enemy soldiers spawn on scripts, not adaptively
Rescue Mission leans a little harder on variance, though the gap is small.
Colin McRae: Dirt
Surface grip and damage add mild run noise
Rescue Mission
Enemy appearance timing adds some unpredictability
Colin McRae: Dirt leans a little harder on optimization, though the gap is small.
Colin McRae: Dirt
Setup tuning and corner-line knowledge underpin pace
Rescue Mission
Prioritizing threats offers light tactics
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.