head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
A first-person horror about a cult in the Arizona wilderness.

Execution · Practiced Mastery
An early top-down rampage shooter with simple execution demands.
Outlast 2 leans Execution (Practiced Mastery); Postal leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Outlast 2
Chase sequences demand quick movement.
Postal
top-down shooting and movement
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Outlast 2
Cultists follow scripts.
Postal
enemies use fixed aggressive scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Outlast 2
Some encounter variability.
Postal
enemy spawn and pathing randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Outlast 2
Route memorization aids survival.
Postal
weapon choice and route clearing
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.