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
Minimalist rhythm minigame collection demanding near-perfect beat timing.

Execution · Pure Mechanics
Terry Cavanagh's minimalist reflex gauntlet of rotating walls measured in seconds survived.
Rhythm Heaven leans Execution (Pure Mechanics); Super Hexagon leans Execution (Pure Mechanics).
Super Hexagon leans a little harder on execution, though the gap is small.
Rhythm Heaven
Pure timing precision against audio cues.
Super Hexagon
Sub-second reactions at extreme speed, pure reflex ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Rhythm Heaven
No opponent exists.
Super Hexagon
No opponent, only walls
Super Hexagon leans a little harder on variance, though the gap is small.
Rhythm Heaven
Cue patterns are fixed once heard.
Super Hexagon
Pattern order randomized from a known set
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Rhythm Heaven
Learning each minigame's rhythm is shallow and quick.
Super Hexagon
Pattern vocabulary is small, reaction is everything
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.