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
Engineering precise gas, liquid, and power circuits to keep a subterranean colony alive indefinitely.

Optimization · Pure Optimization
Frosty deckbuilder built around countdown timers and tribal synergies.
Oxygen Not Included leans Optimization (Pure Optimization); Wildfrost 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.
Oxygen Not Included
All inputs are build-order clicks; no twitch required
Wildfrost
Turn-based card play, no input demand.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Oxygen Not Included
No adversary of any kind exists in the colony
Wildfrost
Enemy scripts only, no adaptive opponent.
Wildfrost leans a little harder on variance, though the gap is small.
Oxygen Not Included
Asteroid seed and geyser placement carry meaningful but bounded randomness
Wildfrost
Card and charm rolls swing runs heavily.
Oxygen Not Included leans a little harder on optimization, though the gap is small.
Oxygen Not Included
Gas, liquid, and power engineering are essentially a solvable engineering puzzle
Wildfrost
Counter timers and combos reward tight planning.
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.