head to head
Championship Manager 2008 asks more than Hearts of Iron IV, and the gap is variance.

Optimization · Pure Optimization
A football management sim about building squads and optimizing tactics against variance.

Optimization · Pure Optimization
WWII grand strategy: templates, production, and focus paths.
Championship Manager 2008 leans Optimization (Pure Optimization); Hearts of Iron IV leans Optimization (Pure Optimization).
Hearts of Iron IV leans a little harder on execution, though the gap is small.
Championship Manager 2008
Menu management requires no physical skill
Hearts of Iron IV
pausable, micromanagement-heavy
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Championship Manager 2008
Opponent AI tactics are somewhat predictable patterns
Hearts of Iron IV
PvP partly, mostly scripted AI
Championship Manager 2008 leans clearly harder on variance.
Championship Manager 2008
Match results and injuries carry significant randomness
Hearts of Iron IV
focus tree branches, events
Hearts of Iron IV leans a little harder on optimization, though the gap is small.
Championship Manager 2008
Squad building, tactics and transfers are the deep core
Hearts of Iron IV
division templates and production solved
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.