head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

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

Optimization · Pure Optimization
Handheld SMT where smirk RNG stings but fusion planning and weakness knowledge carry you.
Persona 4 leans Optimization (Pure Optimization); Shin Megami Tensei IV 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
Shin Megami Tensei IV
Menu combat with no execution ceiling.
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
Shin Megami Tensei IV
Demon negotiation is random personality scripts.
Shin Megami Tensei IV leans a little harder on variance, though the gap is small.
Persona 4
Randomized dungeon floors and fusion rolls
Shin Megami Tensei IV
Smirk procs and negotiation RNG swing fights hard.
Shin Megami Tensei IV leans a little harder on optimization, though the gap is small.
Persona 4
Social link scheduling and weakness-exploit planning
Shin Megami Tensei IV
Fusion apps, weakness charts, and builds solve 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.