head to head
Star Wars: Empire at War asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Managing galactic economy and fleet counters, with prediction mattering against humans.
Portal 2 leans Optimization (Pure Optimization); Star Wars: Empire at 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.
Portal 2
Portal placement requires some precision but timing is lenient.
Star Wars: Empire at War
Some battle micro, but APM never dominates outcomes
Star Wars: Empire at War leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
Star Wars: Empire at War
Multiplayer galactic feints and fleet composition mind-games matter
Star Wars: Empire at War leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Star Wars: Empire at War
Fog of war hides enemy fleets until scouted
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Star Wars: Empire at War
Economy, tech order and counter-unit composition decide campaigns
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.