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
Sequel rhythm game with harder setlists and refined plastic-guitar technique.

Execution · Pure Mechanics
Nintendo's minigame rhythm collection where everything reduces to feeling the beat exactly.
Guitar Hero II leans Execution (Pure Mechanics); Rhythm Heaven Fever leans Execution (Pure Mechanics).
Guitar Hero II leans a little harder on execution, though the gap is small.
Guitar Hero II
Harder charts, hammer-ons, and three-note chords
Rhythm Heaven Fever
Strict beat-perfect timing windows across minigames
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Guitar Hero II
Static note highways
Rhythm Heaven Fever
Scripted rhythm patterns only
Rhythm Heaven Fever leans a little harder on variance, though the gap is small.
Guitar Hero II
Fully deterministic charts
Rhythm Heaven Fever
Minor visual fakeouts, audio is fully fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guitar Hero II
Star power pathing for leaderboard play
Rhythm Heaven Fever
Little to plan, internalize the beat and go
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.