head to head
Neither is simply harder - they are hard in different places. Super Mario World demands more optimization; WarioWare: Touched! demands more variance.

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

Execution · Pure Mechanics
Touch-screen reaction speed against a randomised barrage of microgames.
Super Mario World leans Execution (Pure Mechanics); WarioWare: Touched! 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.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
WarioWare: Touched!
Instant stylus reactions to five-second prompts are everything
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
WarioWare: Touched!
No opponent - just escalating microgame speed
WarioWare: Touched! leans clearly harder on variance.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
WarioWare: Touched!
Random microgame order demands instant recognition
Super Mario World leans clearly harder on optimization.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
WarioWare: Touched!
Each microgame is trivially solvable once recognised
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.