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
Optimising a daily calendar and persona fusion economy against scripted turn-based combat.

Optimization · Pure Optimization
Engineering self-sustaining closed-loop life support systems on a hostile planet against scripted environmental events.
Persona 3 FES leans Optimization (Pure Optimization); Planetbase 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 3 FES
Menu-driven turn battles need no physical skill
Planetbase
Building placement is unhurried and menu-driven throughout
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 3 FES
Shadow AI is scripted weakness-exploitation, never adaptive
Planetbase
No adversarial AI; threats are scripted event types
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 3 FES
Tartarus floors, shuffle cards and fusion outcomes are randomised
Planetbase
Solar storm timing and resource availability add hidden pressure
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Persona 3 FES
Social link scheduling and persona fusion are a solvable calendar
Planetbase
Power and oxygen loops are tightly engineered optimization puzzles
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.