head to head
Super Meat Boy asks more than Super Mario World, and the gap is execution.

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

Execution · Pure Mechanics
A brutally precise platformer about dying thousands of times.
Super Mario World leans Execution (Pure Mechanics); Super Meat Boy leans Execution (Pure Mechanics).
Super Meat Boy leans clearly harder on execution.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Super Meat Boy
Pure twitch platforming, frame-perfect jumps
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
Super Meat Boy
No adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Super Meat Boy
Fully deterministic levels
Super Mario World leans a little harder on optimization, though the gap is small.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Super Meat Boy
Route memorization optimizes times
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.