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.

Optimization · Pure Optimization
Stylish JRPG where phantom thieves steal hearts on a tightly optimized school calendar.

Optimization · Pure Optimization
Generous team-building optimisation against fixed Kalos trainers.
Persona 5 leans Optimization (Pure Optimization); Pokémon Y leans Optimization (Pure Optimization).
Persona 5 leans a little harder on execution, though the gap is small.
Persona 5
Stylish menus, not reflexes
Pokémon Y
Turn-based menus have no physical ceiling
Pokémon Y leans a little harder on reads, though the gap is small.
Persona 5
Palace enemies use fixed weaknesses
Pokémon Y
Campaign trainers are scripted; online play is a separate pursuit
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5
Fusion alerts and negotiation rolls
Pokémon Y
Encounters and rolls add bounded, mappable randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5
Confidant calendar routing and baton-pass weakness chains
Pokémon Y
Mega evolutions and EV tools make optimisation the core
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.