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
Pure factory-layout optimization with no pressure, randomness or opponent.
Factorio leans Optimization (Pure Optimization); Shapez 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.
Shapez
Placing belts has no time pressure at all
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.
Shapez
No adversary exists anywhere
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Factorio
Resource patch placement adds minor map randomness.
Shapez
The infinite map's shapes are mappable immediately
Factorio leans a little harder on optimization, though the gap is small.
Factorio
Throughput, ratios, and logistics are the entire game.
Shapez
Designing efficient cutting and merging factories IS the game
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.