head to head
Path of Exile asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A theorycraft-dense ARPG about engineering builds through randomised loot and crafting.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Path of Exile leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Path of Exile
Some dodge and reflex play, but build carries fights.
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Path of Exile
Mobs and bosses are scripted; no adaptation.
Portal
No adversary modeling player.
Path of Exile leans clearly harder on variance.
Path of Exile
Loot, map mods, and crafting outcomes are heavily random.
Portal
Deterministic chambers; no randomness.
Path of Exile leans clearly harder on optimization.
Path of Exile
Passive tree, crafting, and economy form near-infinite theorycraft.
Portal
Pure puzzle-solving optimization.
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.