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

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

Optimization · Pure Optimization
Hybrid game fusing party-based RPG questing with full RTS base building and sector economies.
Empire: Total War leans Optimization (Pure Optimization); SpellForce 3 leans Optimization (Pure Optimization).
SpellForce 3 leans a little harder on execution, though the gap is small.
Empire: Total War
Real-time battle micro is modest
SpellForce 3
RTS base control plus hero micro at moderate pace
Empire: Total War leans a little harder on reads, though the gap is small.
Empire: Total War
Multiplayer line-battle feints exist
SpellForce 3
Skirmish PvP exists but is a small scene
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Empire: Total War
Campaign AI and battle dice noise
SpellForce 3
Loot drops and map events in RPG sections
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Empire: Total War
Campaign economy and line-infantry tactics are mappable
SpellForce 3
Hero builds, sector economy, and army composition 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.