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
A colonial-fantasy RPG won by faction routing and build optimization.

Optimization · Pure Optimization
A perk-driven sci-fi RPG won by flaw selection and dialogue routing.
Greedfall leans Optimization (Pure Optimization); The Outer Worlds 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.
Greedfall
Lock-on action combat, modest demand
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.
Greedfall
Scripted enemy patterns
The Outer Worlds
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Greedfall
Loot and check rolls
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.
Greedfall
Faction routing, builds, crafting central
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.