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 turn-based tactics game with Mario and Rabbid characters.
Hearts of Iron IV leans Optimization (Pure Optimization); Mario + Rabbids Sparks of Hope 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
Mario + Rabbids Sparks of Hope
Menu-driven actions, light aim
Hearts of Iron IV leans a little harder on reads, though the gap is small.
Hearts of Iron IV
PvP partly, mostly scripted AI
Mario + Rabbids Sparks of Hope
Some AI positioning to anticipate
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
Mario + Rabbids Sparks of Hope
Hit chances and spark draws
Hearts of Iron IV leans a little harder on optimization, though the gap is small.
Hearts of Iron IV
division templates and production solved
Mario + Rabbids Sparks of Hope
Team comp, spark synergy, positioning
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.