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
Cute two-button rhythm game where everything reduces to hitting notes on beat.

Execution · Pure Mechanics
Rhythm game where clicking circles to the beat becomes an athletic discipline.
Muse Dash leans Execution (Pure Mechanics); osu! leans Execution (Pure Mechanics).
osu! leans a little harder on execution, though the gap is small.
Muse Dash
Two-lane rhythm hits at high BPM are pure hands
osu!
Pixel-perfect cursor aim and tapping at extreme speeds
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Muse Dash
Charts never adapt
osu!
No opponent interaction in scoring
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Muse Dash
Fully deterministic note charts
osu!
Beatmaps are fully deterministic
Muse Dash leans a little harder on optimization, though the gap is small.
Muse Dash
Character buffs and chart memorization help margins
osu!
Mod choices and map selection for ranking
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.