head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
A rally racer where mastering precise car control against tricky terrain is everything.

Execution · Pure Mechanics
An arcade hybrid testing precise orb control and dodging under scripted bullet pressure.
Colin McRae: Dirt 2 leans Execution (Pure Mechanics); Touhou Rei'iden: The Highly Responsive to Prayers 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
Touhou Rei'iden: The Highly Responsive to Prayers
Controlling the orb while dodging dense fire demands precise inputs
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
Touhou Rei'iden: The Highly Responsive to Prayers
Bosses and cards are scripted, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt 2
weather and surface conditions vary
Touhou Rei'iden: The Highly Responsive to Prayers
Orb physics bounce unpredictably moment to moment
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
Touhou Rei'iden: The Highly Responsive to Prayers
Learning stage layouts and boss patterns helps but hands decide
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.
full breakdown
Colin McRae: Dirt 2 →
full breakdown
Touhou Rei'iden: The Highly Responsive to Prayers →