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 · Practiced Mastery
A retro-styled action platformer with pogo-stick combat.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Shovel Knight leans Execution (Practiced Mastery); Super Mario World leans Execution (Pure Mechanics).
Super Mario World leans a little harder on execution, though the gap is small.
Shovel Knight
Pogo combat and platforming need timing
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Shovel Knight leans a little harder on reads, though the gap is small.
Shovel Knight
Scripted boss patterns, not reads
Super Mario World
Scripted Koopas adapt to nothing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Shovel Knight
Deterministic stages
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.
Shovel Knight
Relic and upgrade choices shape runs
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.