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
Memorising punishing fixed stages and executing precise run-and-gun inputs.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Journey to Silius leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Journey to Silius leans a little harder on execution, though the gap is small.
Journey to Silius
Precise jumps and dodges under NES-hard pressure define it
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.
Journey to Silius
Every enemy and boss is rigidly scripted
Super Mario World
Scripted Koopas adapt to nothing
Super Mario World leans a little harder on variance, though the gap is small.
Journey to Silius
Identical layouts and spawns every attempt
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Journey to Silius leans a little harder on optimization, though the gap is small.
Journey to Silius
Weapon-energy budgeting and pattern memorisation make clears possible
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.