head to head
Tom Clancy's EndWar asks more than Empire: Total War, and the gap is reads.

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

Optimization · Mind & Math
Counter-picking units and out-planning opponents with your voice instead of clicks.
Empire: Total War leans Optimization (Pure Optimization); Tom Clancy's EndWar leans Optimization (Mind & Math).
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
Tom Clancy's EndWar
Voice commands remove most mechanical demand by design
Tom Clancy's EndWar leans clearly harder on reads.
Empire: Total War
Multiplayer line-battle feints exist
Tom Clancy's EndWar
Multiplayer theatre battles reward predicting enemy unit commitments
Empire: Total War leans a little harder on variance, though the gap is small.
Empire: Total War
Campaign AI and battle dice noise
Tom Clancy's EndWar
Fog of war hides compositions until scouted
Empire: Total War leans a little harder on optimization, though the gap is small.
Empire: Total War
Campaign economy and line-infantry tactics are mappable
Tom Clancy's EndWar
Rock-paper-scissors unit counters and upgrade economy are the solvable core
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.