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

Optimization · Pure Optimization
Designing ships and spreading influence across a randomly generated galaxy through deep optimization.

Optimization · Pure Optimization
Engineer a pandemic; evolution order is the puzzle.
Galactic Civilizations III leans Optimization (Pure Optimization); Plague Inc: Evolved 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.
Galactic Civilizations III
Fully turn-based; no physical skill axis
Plague Inc: Evolved
no reflex
Galactic Civilizations III leans a little harder on reads, though the gap is small.
Galactic Civilizations III
AI races have static personalities and no adaptive opponent modelling
Plague Inc: Evolved
world response scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Galactic Civilizations III
Random galaxy layouts and events add manageable unknowns
Plague Inc: Evolved
country event timing
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Galactic Civilizations III
Ship design, influence spreading, and tech tree form a deep optimization puzzle
Plague Inc: Evolved
evolution order heavily 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.