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
A rally racer where mastering precise car control against tricky terrain is everything.

Execution · Pure Mechanics
A driving-combat arcade classic where an armed spy car battles enemy vehicles down endless highways.
Colin McRae: Dirt 2 leans Execution (Pure Mechanics); Spy Hunter 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 2
precise rally driving and braking required
Spy Hunter
High-speed weaving, ramming, and weapon timing demand sharp hands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt 2
no adaptive opponents, mostly time trials
Spy Hunter
Enemy vehicles attack on fixed behaviours.
Spy Hunter leans a little harder on variance, though the gap is small.
Colin McRae: Dirt 2
weather and surface conditions vary
Spy Hunter
Traffic and enemy mix vary each run.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt 2
car tuning and racing lines solvable
Spy Hunter
Weapon-van timing and road knowledge are learnable.
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.