head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; War for the Overworld demands more reads.

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

Optimization · Pure Optimization
A Dungeon Keeper successor about building an evil lair and crushing do-gooders.
Portal leans Optimization (Pure Optimization); War for the Overworld leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
War for the Overworld
Mouse-driven dungeon management; light APM demand
War for the Overworld leans clearly harder on reads.
Portal
No adversary modeling player.
War for the Overworld
Skirmish humans adapt; campaign AI is scripted
War for the Overworld leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
War for the Overworld
Enemy dungeon layout hidden until scouted
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 for the Overworld
Room economy, minion synergy, and build order 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.