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
The original post-apocalyptic CRPG where character builds solve the wasteland.

Optimization · Systems & Chaos
The first Persona, a slow dungeon crawler where random negotiation moods and fusion knowledge rule.
Fallout leans Optimization (Pure Optimization); Revelations: Persona leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout
Turn-based, no dexterity
Revelations: Persona
Grid-position menu battles; no dexterity.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout
No adaptive opposition
Revelations: Persona
Negotiation moods are random scripts, not adaptation.
Revelations: Persona leans a little harder on variance, though the gap is small.
Fallout
To-hit rolls and random encounters
Revelations: Persona
Mood rolls and harsh encounter RNG dominate early.
Fallout leans a little harder on optimization, though the gap is small.
Fallout
SPECIAL builds and quest routing are deeply solvable
Revelations: Persona
Persona fusion and grid positioning are learnable systems.
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.