head to head
Frostpunk asks more than Cities: Skylines, and the gap is variance.

Optimization · Pure Optimization
A sandbox city builder that is pure traffic and zoning optimization.

Optimization · Pure Optimization
A survival city builder driven by harsh resource and law optimization.
Cities: Skylines leans Optimization (Pure Optimization); Frostpunk 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.
Cities: Skylines
No reflex demands at all.
Frostpunk
Pausable strategy with no input precision.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Cities: Skylines
No adaptive opponent exists in the sandbox.
Frostpunk
No adaptive opponent in the survival city.
Frostpunk leans clearly harder on variance.
Cities: Skylines
Minor disaster events if enabled.
Frostpunk
Scenario events and weather pulses add tension.
Cities: Skylines leans a little harder on optimization, though the gap is small.
Cities: Skylines
Traffic flow, zoning, and budgets are fully solvable.
Frostpunk
Resource routing, laws, and heat are solvable.
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.