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
Precise jump execution across fixed levels with secrets to memorise.

Execution · Pure Mechanics
Trick-execution mastery and optimised line routing for combo scores.
Super Mario World leans Execution (Pure Mechanics); Tony Hawk's Project 8 leans Execution (Pure Mechanics).
Tony Hawk's Project 8 leans a little harder on execution, though the gap is small.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Tony Hawk's Project 8
Combo stringing, balance meters and Nail-the-Trick demand trained hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario World
Scripted Koopas adapt to nothing
Tony Hawk's Project 8
Solo score runs against static environments
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
Tony Hawk's Project 8
Levels are fully deterministic
Tony Hawk's Project 8 leans a little harder on optimization, though the gap is small.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Tony Hawk's Project 8
Line routing for maximum combo score rewards study
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.