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
A turn-based tactical strategy game with insect squads.

Optimization · Pure Optimization
Gunpowder-era Total War blending empire management with line battles.
Band of Bugs leans Optimization (Pure Optimization); Empire: Total War 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.
Band of Bugs
minimal direct control, turn-based tactical movement
Empire: Total War
Real-time battle micro is modest
Empire: Total War leans a little harder on reads, though the gap is small.
Band of Bugs
minor prediction versus AI and human opponents
Empire: Total War
Multiplayer line-battle feints exist
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Band of Bugs
random combat resolution elements
Empire: Total War
Campaign AI and battle dice noise
Empire: Total War leans a little harder on optimization, though the gap is small.
Band of Bugs
squad tactics and positioning deeply solvable
Empire: Total War
Campaign economy and line-infantry tactics are mappable
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.