head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Procedural space exploration sandbox with crafting depth.

Optimization · Pure Optimization
A creative engineering sandbox where machines built from logic and bearings do the heavy lifting.
No Man's Sky leans Optimization (Pure Optimization); Scrap Mechanic 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.
No Man's Sky
Light shooter and flight inputs
Scrap Mechanic
Basic movement and combat; building is unhurried.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
No Man's Sky
Mostly solo, sparse PvP
Scrap Mechanic
Robot enemies are scripted and predictable.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
No Man's Sky
Procedural planets and loot
Scrap Mechanic
Survival mode loot and world generation add some randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
No Man's Sky
Base, freighter, expedition progression
Scrap Mechanic
Logic gates, bearings and farm automation reward pure engineering.
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.