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.

Optimization · Pure Optimization
Meditative cleaning sim about systematic spray work.

Optimization · Pure Optimization
A cheerful farming-sim sequel about ranching alien slimes for profit.
PowerWash Simulator leans Optimization (Pure Optimization); Slime Rancher 2 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.
PowerWash Simulator
Aim and sweep nozzle precision
Slime Rancher 2
light movement and vacuum-aim execution
Slime Rancher 2 leans a little harder on reads, though the gap is small.
PowerWash Simulator
No adaptive opponents
Slime Rancher 2
no adaptive opposition, solo farming sim
Slime Rancher 2 leans a little harder on variance, though the gap is small.
PowerWash Simulator
Minimal, dirt is fixed
Slime Rancher 2
slime spawn and behavior randomness minor
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
PowerWash Simulator
Nozzle choice, routing, completion efficiency
Slime Rancher 2
ranch layout and economy optimization dominate
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.