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
Engineering self-sustaining closed-loop life support systems on a hostile planet against scripted environmental events.
Persona 4 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 4
Menu combat; zero dexterity
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 4
Shadow bosses use scripted patterns
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 4
Randomized dungeon floors and fusion rolls
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 4
Social link scheduling and weakness-exploit planning
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.