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
Solving an interlocking policy simulation to stay elected - nearly pure systems play.

Optimization · Pure Optimization
Strategy sim about evolving a pathogen to outpace the world's cure effort.
Democracy 4 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.
Democracy 4
Clicking policy sliders involves zero physical skill
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.
Democracy 4
Voter blocs react by fixed simulation rules, not adaptation
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.
Democracy 4
Random events and hidden voter thresholds inject mild uncertainty
Plague Inc.
Spread events and cure pace fluctuate
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Democracy 4
A perfect coach solves the policy-web economy almost entirely
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.