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
A frantic SNES space-western gallery shooter about dodging while you shoot.
Super Mario World leans Execution (Pure Mechanics); Wild Guns leans Execution (Pure Mechanics).
Wild Guns leans a little harder on execution, though the gap is small.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Wild Guns
Simultaneous aiming and dodging defines the whole game
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
Wild Guns
Enemy waves are fully scripted
Wild Guns leans a little harder on variance, though the gap is small.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Wild Guns
Bullet spawns vary slightly until patterns are absorbed
Wild Guns leans a little harder on optimization, though the gap is small.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Wild Guns
Stage routing and pattern memorization converge for high scores
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.