head to head
War Selection asks more than Portal, and the gap is reads.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
A survival strategy game about building a civilization while battling other players.
Portal leans Optimization (Pure Optimization); War Selection leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
War Selection
Some real-time control but not twitch-focused.
War Selection leans clearly harder on reads.
Portal
No adversary modeling player.
War Selection
Human opponents in multiplayer require some prediction.
War Selection leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
War Selection
Resource spawns and combat rolls add unpredictability.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Pure puzzle-solving optimization.
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.