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
A rhythm racer that turns any music file into a reflex puzzle track.

Execution · Pure Mechanics
A minimalist vector rhythm game that generates obstacle courses from any music CD.
Audiosurf leans Execution (Pure Mechanics); Vib-Ribbon leans Execution (Pure Mechanics).
Vib-Ribbon leans a little harder on execution, though the gap is small.
Audiosurf
Lane-switching to the beat tests reaction speed.
Vib-Ribbon
Precise button timing to obstacle patterns is everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Audiosurf
No opponent.
Vib-Ribbon
No opponent, just the track
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Audiosurf
Track generated from song, then fixed.
Vib-Ribbon
Tracks generated from your own music CDs
Audiosurf leans a little harder on optimization, though the gap is small.
Audiosurf
Block-matching color strategy learnable per song.
Vib-Ribbon
Pattern-to-button mapping is learned, then perfected
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.