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
Map-painting grand strategy ruled by mana and idea optimization.

Optimization · Pure Optimization
A tactical RPG testing positioning and turn prediction on a grid battlefield.
Europa Universalis IV leans Optimization (Pure Optimization); Vandal Hearts II 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.
Europa Universalis IV
pausable, no twitch
Vandal Hearts II
Simultaneous-turn combat has no twitch input
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Europa Universalis IV
AI mostly scripted, some MP
Vandal Hearts II
Predicting AI move order matters but follows scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Europa Universalis IV
events, mission paths
Vandal Hearts II
Hit chances add bounded randomness
Europa Universalis IV leans a little harder on optimization, though the gap is small.
Europa Universalis IV
idea groups, economy, mana spending
Vandal Hearts II
Unit positioning, builds and the prediction system win battles
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.