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
WWII grand strategy: templates, production, and focus paths.

Optimization · Pure Optimization
A tactical RPG testing positioning and turn prediction on a grid battlefield.
Hearts of Iron 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.
Hearts of Iron IV
pausable, micromanagement-heavy
Vandal Hearts II
Simultaneous-turn combat has no twitch input
Hearts of Iron IV leans a little harder on reads, though the gap is small.
Hearts of Iron IV
PvP partly, mostly scripted AI
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.
Hearts of Iron IV
focus tree branches, events
Vandal Hearts II
Hit chances add bounded randomness
Hearts of Iron IV leans a little harder on optimization, though the gap is small.
Hearts of Iron IV
division templates and production solved
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.