head to head
Two Worlds II asks more than Portal, and the gap is variance.

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

Optimization · Pure Optimization
An open-world fantasy RPG whose modular magic and crafting systems reward heavy theorycrafting.
Portal leans Optimization (Pure Optimization); Two Worlds II leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
Two Worlds II
Loose action combat, low ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Two Worlds II
Enemies follow fixed AI
Two Worlds II leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Two Worlds II
Loot rolls and unexplored map
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Two Worlds II
Spell-card crafting and builds break the game
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.