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.

Optimization · Pure Optimization
A factory-engineering sandbox about scaling throughput against your own bottlenecks.

Optimization · Pure Optimization
Eastern-bloc planned-economy sim built on logistics chains.
Factorio leans Optimization (Pure Optimization); Workers & Resources: Soviet Republic leans Optimization (Pure Optimization).
Factorio leans a little harder on execution, though the gap is small.
Factorio
Some APM in early hand-crafting; otherwise irrelevant.
Workers & Resources: Soviet Republic
no reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Factorio
Biters follow fixed pollution rules; no adaptive opponent.
Workers & Resources: Soviet Republic
no adversary
Workers & Resources: Soviet Republic leans a little harder on variance, though the gap is small.
Factorio
Resource patch placement adds minor map randomness.
Workers & Resources: Soviet Republic
weather, resource finds
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Factorio
Throughput, ratios, and logistics are the entire game.
Workers & Resources: Soviet Republic
logistics chains and infrastructure central
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.