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 pure lane-timing reflex test against head-on collision cars.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Dodge 'Em leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Super Mario World leans a little harder on execution, though the gap is small.
Dodge 'Em
Lane-switch timing against closing cars is the whole game
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.
Dodge 'Em
Computer cars chase head-on by simple fixed logic
Super Mario World
Scripted Koopas adapt to nothing
Dodge 'Em leans a little harder on variance, though the gap is small.
Dodge 'Em
Opposing car spawns vary slightly per loop
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Super Mario World leans a little harder on optimization, though the gap is small.
Dodge 'Em
Optimal lane patterns are quickly learnable
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.