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

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Colin McRae: Dirt 2 leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Colin McRae: Dirt 2 leans a little harder on execution, though the gap is small.
Colin McRae: Dirt 2
precise rally driving and braking required
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
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
Super Mario World
Scripted Koopas adapt to nothing
Colin McRae: Dirt 2 leans a little harder on variance, though the gap is small.
Colin McRae: Dirt 2
weather and surface conditions vary
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
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
Super Mario World
Secret exits and route knowledge add a modest solvable layer
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.