head to head
Neither is simply harder - they are hard in different places. Super Mario World demands more optimization; Time Surfer demands more variance.

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

Execution · Pure Mechanics
An endless runner where players slow and speed time to dodge obstacles.
Super Mario World leans Execution (Pure Mechanics); Time Surfer leans Execution (Pure Mechanics).
Time Surfer leans a little harder on execution, though the gap is small.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Time Surfer
precise timing-based reflex dodging
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
Time Surfer
no opponent, solo endless runner
Time Surfer leans clearly harder on variance.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Time Surfer
procedurally generated obstacle patterns
Super Mario World leans clearly harder on optimization.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Time Surfer
minimal strategic depth beyond reflexes
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.