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.

Execution · Light / Casual
Chaotic physics sandbox starring a goat.

Execution · Light / Casual
A first-person horror about a journalist investigating an asylum.
Goat Simulator 3 leans Execution (Light / Casual); Outlast leans Execution (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Goat Simulator 3
Loose physics goat control
Outlast
Running, hiding, and camera use.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Goat Simulator 3
No adaptive opponents
Outlast
Enemies follow scripts.
Goat Simulator 3 leans a little harder on variance, though the gap is small.
Goat Simulator 3
Glitchy emergent physics events
Outlast
Mild patrol variance.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Goat Simulator 3
Mutator and gear combo discovery
Outlast
Battery and route planning shallow.
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.