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
Pioneering rhythm game where a rapping dog believes his way through button-cue raps.

Execution · Pure Mechanics
A synesthetic on-rails shooter where lock-on fire becomes part of the trance soundtrack.
PaRappa the Rapper leans Execution (Pure Mechanics); Rez leans Execution (Pure Mechanics).
PaRappa the Rapper leans a little harder on execution, though the gap is small.
PaRappa the Rapper
Hitting button cues on beat is the whole game
Rez
Lock-on targeting in time with the beat tests aim and rhythm
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
PaRappa the Rapper
No opponent; teachers follow set lines
Rez
Enemy waves are entirely scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
PaRappa the Rapper
Songs are fixed sequences
Rez
Fixed rail paths; nothing is hidden after one run
Rez leans a little harder on optimization, though the gap is small.
PaRappa the Rapper
Freestyle scoring quirks for Cool rank
Rez
Score chains and route choices reward memorized play
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.