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

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

Execution · Practiced Mastery
An early top-down rampage shooter with simple execution demands.
Goat Simulator 3 leans Execution (Light / Casual); Postal leans Execution (Practiced Mastery).
Postal leans a little harder on execution, though the gap is small.
Goat Simulator 3
Loose physics goat control
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.
Goat Simulator 3
No adaptive opponents
Postal
enemies use fixed aggressive scripts
Goat Simulator 3 leans a little harder on variance, though the gap is small.
Goat Simulator 3
Glitchy emergent physics events
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.
Goat Simulator 3
Mutator and gear combo discovery
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.