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

Execution · Pure Mechanics
Arcade reflex shooting under timers with memorisable rescue routes.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Alien Syndrome leans Execution (Pure Mechanics); Super Mario World 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.
Alien Syndrome
Dodging swarms under a bomb timer is pure arcade reflex
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.
Alien Syndrome
Aliens swarm on fixed spawn logic
Super Mario World
Scripted Koopas adapt to nothing
Alien Syndrome leans a little harder on variance, though the gap is small.
Alien Syndrome
Hostage and weapon spots are unknown until learned
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.
Alien Syndrome
Routes to hostages and boss patterns are fully mappable
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.