head to head
Neither is simply harder - they are hard in different places. Guitar Hero II demands more execution; Super Mario World demands more optimization.

Execution · Pure Mechanics
Sequel rhythm game with harder setlists and refined plastic-guitar technique.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Guitar Hero II leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Guitar Hero II leans clearly harder on execution.
Guitar Hero II
Harder charts, hammer-ons, and three-note chords
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.
Guitar Hero II
Static note highways
Super Mario World
Scripted Koopas adapt to nothing
Super Mario World leans a little harder on variance, though the gap is small.
Guitar Hero II
Fully deterministic charts
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Super Mario World leans clearly harder on optimization.
Guitar Hero II
Star power pathing for leaderboard play
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.