head to head
Legion TD 2 asks more than Hearts of Iron IV, and the gap is reads.

Optimization · Pure Optimization
WWII grand strategy: templates, production, and focus paths.

Optimization · Mind & Math
Economic build optimisation sharpened by predicting what humans send next.
Hearts of Iron IV leans Optimization (Pure Optimization); Legion TD 2 leans Optimization (Mind & Math).
Hearts of Iron IV leans a little harder on execution, though the gap is small.
Hearts of Iron IV
pausable, micromanagement-heavy
Legion TD 2
Placement clicks carry no mechanical pressure
Legion TD 2 leans clearly harder on reads.
Hearts of Iron IV
PvP partly, mostly scripted AI
Legion TD 2
Predicting human opponents' sends and builds is core design
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
Legion TD 2
Rolled units and hidden enemy boards inject uncertainty
Hearts of Iron IV leans a little harder on optimization, though the gap is small.
Hearts of Iron IV
division templates and production solved
Legion TD 2
Value efficiency and wave-by-wave build math dominate
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.