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 · Practiced Mastery
Sustained block-placement speed synced to a sweeping musical timeline.

Execution · Pure Mechanics
Classic Tetris execution under audiovisual flow, speed still decides everything.
Lumines Electronic Symphony leans Execution (Practiced Mastery); Tetris Effect leans Execution (Pure Mechanics).
Tetris Effect leans a little harder on execution, though the gap is small.
Lumines Electronic Symphony
Placing blocks against the timeline sweep demands sustained speed
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.
Lumines Electronic Symphony
Solo - no opponent to predict
Tetris Effect
Solo experience with no opponent to model
Lumines Electronic Symphony leans a little harder on variance, though the gap is small.
Lumines Electronic Symphony
Random block sequences shape each run moderately
Tetris Effect
Randomised bag is bounded and quickly mappable
Lumines Electronic Symphony leans a little harder on optimization, though the gap is small.
Lumines Electronic Symphony
Square-chaining setups and skin-speed strategy reward study
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.