head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
Gunpowder-era Total War blending empire management with line battles.

Optimization · Pure Optimization
A 4X space strategy game about building economy, tech and conquering fleets.
Empire: Total War leans Optimization (Pure Optimization); Imperium Galactica II: Alliances 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.
Empire: Total War
Real-time battle micro is modest
Imperium Galactica II: Alliances
Issuing orders has no twitch requirement
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Empire: Total War
Multiplayer line-battle feints exist
Imperium Galactica II: Alliances
AI empires follow scripted strategies, not adaptive modelling
Empire: Total War leans a little harder on variance, though the gap is small.
Empire: Total War
Campaign AI and battle dice noise
Imperium Galactica II: Alliances
Some randomness in combat and tech but bounded
Imperium Galactica II: Alliances leans a little harder on optimization, though the gap is small.
Empire: Total War
Campaign economy and line-infantry tactics are mappable
Imperium Galactica II: Alliances
Empire economy, tech and fleet building is the whole game
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.