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
Classic Tetris execution under audiovisual flow, speed still decides everything.

Execution · Pure Mechanics
Brutal rhythm-violence game where perfect timing on a screaming track is all that exists.
Tetris Effect leans Execution (Pure Mechanics); Thumper leans Execution (Pure Mechanics).
Thumper leans a little harder on execution, though the gap is small.
Tetris Effect
Piece placement under speed and Zone timing is the whole test
Thumper
Split-second rhythm inputs at speed are the entire test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Tetris Effect
Solo experience with no opponent to model
Thumper
No opponent, only the track
Tetris Effect leans a little harder on variance, though the gap is small.
Tetris Effect
Randomised bag is bounded and quickly mappable
Thumper
Tracks are fixed and learnable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Tetris Effect
Stacking theory and Zone usage have known optimal lines
Thumper
Memorizing patterns and scoring lines helps mastery
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.