head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

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

Optimization · Pure Optimization
A tower defense game built on optimal placement and build strategy.
Factorio leans Optimization (Pure Optimization); Kingdom Rush 5: Alliance 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.
Factorio
Some APM in early hand-crafting; otherwise irrelevant.
Kingdom Rush 5: Alliance
minor click-timing for abilities
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.
Kingdom Rush 5: Alliance
fixed enemy waves, no adaptation
Kingdom Rush 5: Alliance leans a little harder on variance, though the gap is small.
Factorio
Resource patch placement adds minor map randomness.
Kingdom Rush 5: Alliance
minor spawn/damage randomness
Factorio leans a little harder on optimization, though the gap is small.
Factorio
Throughput, ratios, and logistics are the entire game.
Kingdom Rush 5: Alliance
tower placement, build optimization
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.