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
Finger speed and accuracy against fixed note charts of 80s tracks.

Execution · Pure Mechanics
Pioneering rhythm game where a rapping dog believes his way through button-cue raps.
Guitar Hero Encore: Rocks the 80s leans Execution (Pure Mechanics); PaRappa the Rapper leans Execution (Pure Mechanics).
Guitar Hero Encore: Rocks the 80s leans a little harder on execution, though the gap is small.
Guitar Hero Encore: Rocks the 80s
Hitting note charts at speed is a pure motor ceiling
PaRappa the Rapper
Hitting button cues on beat is the whole game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Guitar Hero Encore: Rocks the 80s
No opponent, just the chart
PaRappa the Rapper
No opponent; teachers follow set lines
PaRappa the Rapper leans a little harder on variance, though the gap is small.
Guitar Hero Encore: Rocks the 80s
Charts are fixed and fully memorisable
PaRappa the Rapper
Songs are fixed sequences
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guitar Hero Encore: Rocks the 80s
Star power pathing squeezes out extra score
PaRappa the Rapper
Freestyle scoring quirks for Cool rank
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.