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
A visual programming puzzle that teaches algorithmic thinking through factory-floor instruction sequences.
Factorio leans Optimization (Pure Optimization); Human Resource Machine 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.
Human Resource Machine
Dragging instructions has no timing component
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.
Human Resource Machine
No opponent; purely computational puzzle
Factorio leans a little harder on variance, though the gap is small.
Factorio
Resource patch placement adds minor map randomness.
Human Resource Machine
Input data is fixed per level with no randomness
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.
Human Resource Machine
Writing minimal correct assembly-like programs to pass each input sequence
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.