head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Pure Mechanics
A mobile rhythm game testing tap accuracy on fixed charts beneath a gacha layer.

Execution · Pure Mechanics
Classic Tetris execution under audiovisual flow, speed still decides everything.
Hatsune Miku: Colorful Stage! leans Execution (Pure Mechanics); Tetris Effect leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Hatsune Miku: Colorful Stage!
Tapping dense note charts accurately is the entire test
Tetris Effect
Piece placement under speed and Zone timing is the whole test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hatsune Miku: Colorful Stage!
Charts are fixed and never react
Tetris Effect
Solo experience with no opponent to model
Tetris Effect leans a little harder on variance, though the gap is small.
Hatsune Miku: Colorful Stage!
Gacha pulls affect score multipliers, not play skill
Tetris Effect
Randomised bag is bounded and quickly mappable
Tetris Effect leans a little harder on optimization, though the gap is small.
Hatsune Miku: Colorful Stage!
Team composition and event grinding form a side economy
Tetris Effect
Stacking theory and Zone usage have known optimal lines
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.