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

Optimization · Pure Optimization
A survival city builder driven by harsh resource and law optimization.

Optimization · Pure Optimization
Strategy sim about evolving a pathogen to outpace the world's cure effort.
Frostpunk leans Optimization (Pure Optimization); Plague Inc. 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.
Frostpunk
Pausable strategy with no input precision.
Plague Inc.
Tapping menus only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Frostpunk
No adaptive opponent in the survival city.
Plague Inc.
World response is algorithmic, not adaptive to you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Frostpunk
Scenario events and weather pulses add tension.
Plague Inc.
Spread events and cure pace fluctuate
Frostpunk leans a little harder on optimization, though the gap is small.
Frostpunk
Resource routing, laws, and heat are solvable.
Plague Inc.
Evolution-point timing strategies are largely solved
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.