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

Execution · Light / Casual
A first-person horror about a journalist investigating an asylum.

Execution · Light / Casual
A psychological survival horror game where atmosphere and puzzle-solving matter more than combat.
Outlast leans Execution (Light / Casual); Silent Hill 2 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.
Outlast
Running, hiding, and camera use.
Silent Hill 2
clunky combat with modest execution demand
Silent Hill 2 leans a little harder on reads, though the gap is small.
Outlast
Enemies follow scripts.
Silent Hill 2
enemies scripted, not truly adaptive
Silent Hill 2 leans a little harder on variance, though the gap is small.
Outlast
Mild patrol variance.
Silent Hill 2
fog and enemy placement randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Outlast
Battery and route planning shallow.
Silent Hill 2
puzzle logic and resource use are solvable
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.