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
Cozy space exploration and base-building sandbox.

Optimization · Pure Optimization
A knowledge-based mystery solved by mapping a deterministic solar system.
Astroneer leans Optimization (Pure Optimization); Outer Wilds 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.
Astroneer
Light terrain tool inputs
Outer Wilds
Light piloting, mostly forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Astroneer
No adaptive opponents
Outer Wilds
World is fixed; nothing adapts to you
Astroneer leans a little harder on variance, though the gap is small.
Astroneer
Planet resource distribution
Outer Wilds
Loop is deterministic once understood
Outer Wilds leans a little harder on optimization, though the gap is small.
Astroneer
Base layout, power chains, automation
Outer Wilds
Pure knowledge puzzle - solve the system
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.