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

Optimization · Pure Optimization
Grim space colony sim about keeping a generation-ship station from collapsing.
Frostpunk leans Optimization (Pure Optimization); IXION 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.
IXION
Pause-friendly station management
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.
IXION
Events follow story scripts
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.
IXION
System events and exploration outcomes vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Frostpunk
Resource routing, laws, and heat are solvable.
IXION
Hull sectors, power, and population logistics dominate
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.