head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A tactical RPG spin-off putting the Phantom Thieves into cover-based combat.

Optimization · Pure Optimization
An open-world JRPG where build construction and art rotation planning win battles.
Persona 5 Tactica leans Optimization (Pure Optimization); Xenoblade Chronicles leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5 Tactica
minimal direct control, cover-based tactics
Xenoblade Chronicles
Positioning during auto-attack combat needs minimal dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5 Tactica
scripted enemy AI, not adaptive
Xenoblade Chronicles
Enemy AI runs fixed aggro and art rotations
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5 Tactica
some crit and drop randomness
Xenoblade Chronicles
Drop rates and unexplored zones add mild uncertainty
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 5 Tactica
cover positioning and skill-build mastery
Xenoblade Chronicles
Art rotations, gem crafting and party builds decide fights
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.