head to head
Fallout: New Vegas asks more than PowerWash Simulator, and the gap is optimization.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
Meditative cleaning sim about systematic spray work.
Fallout: New Vegas leans Optimization (Pure Optimization); PowerWash Simulator leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
PowerWash Simulator
Aim and sweep nozzle precision
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
PowerWash Simulator
No adaptive opponents
Fallout: New Vegas leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
PowerWash Simulator
Minimal, dirt is fixed
Fallout: New Vegas leans clearly harder on optimization.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
PowerWash Simulator
Nozzle choice, routing, completion efficiency
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.