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
The definitive transport network sim where perfect rail signaling and routing is the whole game.
Factorio leans Optimization (Pure Optimization); Transport Tycoon Deluxe 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.
Transport Tycoon Deluxe
Pausable map clicking, no dexterity
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.
Transport Tycoon Deluxe
AI competitors follow simple mappable logic
Transport Tycoon Deluxe leans a little harder on variance, though the gap is small.
Factorio
Resource patch placement adds minor map randomness.
Transport Tycoon Deluxe
Industry placement and economy events add slight noise
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.
Transport Tycoon Deluxe
Signal logic and network throughput are literally an engineering problem
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.