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

Optimization · Pure Optimization
A narrative horror game tested primarily by puzzle knowledge and sanity-resource management.

Optimization · Pure Optimization
A perk-driven sci-fi RPG won by flaw selection and dialogue routing.
Amnesia: Rebirth leans Optimization (Pure Optimization); The Outer Worlds leans Optimization (Pure Optimization).
The Outer Worlds leans a little harder on execution, though the gap is small.
Amnesia: Rebirth
Stealth and evasion; no real twitch demands
The Outer Worlds
FPS-lite with time-dilation aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: Rebirth
Enemies patrol fixed routes; no adaptive opponent
The Outer Worlds
Scripted enemies
Amnesia: Rebirth leans a little harder on variance, though the gap is small.
Amnesia: Rebirth
Some encounter timing has variance; story rooms are fixed
The Outer Worlds
Loot rolls, dialogue check variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: Rebirth
Resource management, narrative puzzles and safe-path knowledge are solvable
The Outer Worlds
Perks, flaws, dialogue routing rewarded
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.