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
One-button rhythm platformer where the hardest levels demand thousands of perfect attempts.

Execution · Pure Mechanics
A rhythm game testing precise timing while drumming along to song charts.
Geometry Dash leans Execution (Pure Mechanics); Taiko no Tatsujin: The Drum Master! leans Execution (Pure Mechanics).
Geometry Dash leans a little harder on execution, though the gap is small.
Geometry Dash
Frame-perfect one-button timing over relentless sequences
Taiko no Tatsujin: The Drum Master!
Precise rhythmic timing on every note is everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Geometry Dash
Levels never adapt
Taiko no Tatsujin: The Drum Master!
Solo rhythm game with no opponent to predict
Taiko no Tatsujin: The Drum Master! leans a little harder on variance, though the gap is small.
Geometry Dash
Fully deterministic; identical every attempt
Taiko no Tatsujin: The Drum Master!
Note charts are fixed, no randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Geometry Dash
Memorizing layouts is required but solved quickly
Taiko no Tatsujin: The Drum Master!
Some scoring strategy but timing dominates
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.