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 pure paddle-precision breakout test with nothing hidden beneath.

Execution · Pure Mechanics
Pioneering rhythm game where a rapping dog believes his way through button-cue raps.
Alleyway leans Execution (Pure Mechanics); PaRappa the Rapper leans Execution (Pure Mechanics).
PaRappa the Rapper leans a little harder on execution, though the gap is small.
Alleyway
Paddle precision and angle control decide every screen
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.
Alleyway
Bricks cannot fight back
PaRappa the Rapper
No opponent; teachers follow set lines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alleyway
Ball physics are deterministic with minor bounce uncertainty
PaRappa the Rapper
Songs are fixed sequences
PaRappa the Rapper leans a little harder on optimization, though the gap is small.
Alleyway
Brick-clearing order barely matters beyond basics
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.