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
Small-town murder-mystery JRPG balancing friendships by day and TV-world dungeons by night.

Optimization · Pure Optimization
Mastering faithful D&D 3.5 rules and party builds against dice-roll swing.
Persona 4 leans Optimization (Pure Optimization); The Temple of Elemental Evil 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 4
Menu combat; zero dexterity
The Temple of Elemental Evil
Turn-based clicks - hands never matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 4
Shadow bosses use scripted patterns
The Temple of Elemental Evil
Encounters run on D&D scripts, not adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 4
Randomized dungeon floors and fusion rolls
The Temple of Elemental Evil
Dice rolls swing fights until builds overpower them
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 4
Social link scheduling and weakness-exploit planning
The Temple of Elemental Evil
Mastering 3.5e rules, builds and positioning is the game
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.