head to head
War Selection 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
A survival strategy game about building a civilization while battling other players.
Portal 2 leans Optimization (Pure Optimization); War Selection 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.
War Selection
Some real-time control but not twitch-focused.
War Selection leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
War Selection
Human opponents in multiplayer require some prediction.
War Selection leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
War Selection
Resource spawns and combat rolls add unpredictability.
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
War Selection
Base-building and civilization strategy are deeply solvable.
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.