head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.

Execution · Pure Mechanics
Arcade racing lines and traffic-dodging reflexes on memorisable tracks.
Super Mario World leans Execution (Pure Mechanics); Test Drive 6 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.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Test Drive 6
Cornering at speed through traffic is the entire challenge
Test Drive 6 leans a little harder on reads, though the gap is small.
Super Mario World
Scripted Koopas adapt to nothing
Test Drive 6
AI racers follow rubber-band scripts, not minds to model
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Test Drive 6
Traffic adds mild unpredictability to known tracks
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Test Drive 6
Learning racing lines and car choice is solvable
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.