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

Optimization · Pure Optimization
Solving a civilisation-scale resource and governance puzzle before an ecological deadline.

Optimization · Pure Optimization
Map-painting grand strategy ruled by mana and idea optimization.
Eco leans Optimization (Pure Optimization); Europa Universalis IV leans Optimization (Pure Optimization).
Europa Universalis IV leans a little harder on execution, though the gap is small.
Eco
No twitch element; all actions are build and craft clicks
Europa Universalis IV
pausable, no twitch
Europa Universalis IV leans a little harder on reads, though the gap is small.
Eco
Other players add mild human negotiation reads in multiplayer
Europa Universalis IV
AI mostly scripted, some MP
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Eco
Meteor timer and ecosystem variables carry some hidden uncertainty
Europa Universalis IV
events, mission paths
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Eco
Government systems, specialisation routing, and ecosystem management are richly solvable
Europa Universalis IV
idea groups, economy, mana spending
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.