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
Precise jump execution across fixed levels with secrets to memorise.

Execution · Pure Mechanics
Tetris with a puzzle mode - still a test of placement speed and stacking craft.
Super Mario World leans Execution (Pure Mechanics); Tetris Plus leans Execution (Pure Mechanics).
Tetris Plus leans a little harder on execution, though the gap is small.
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Tetris Plus
Piece placement speed under pressure decides everything
Tetris Plus leans a little harder on reads, though the gap is small.
Super Mario World
Scripted Koopas adapt to nothing
Tetris Plus
Versus mode adds only light opponent awareness
Tetris Plus leans a little harder on variance, though the gap is small.
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Tetris Plus
Random piece order is bounded and rapidly mappable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario World
Secret exits and route knowledge add a modest solvable layer
Tetris Plus
Puzzle-mode professor routes have known optimal solutions
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.