head to head
WoW Classic 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 slower, more deliberate MMORPG where optimal preparation and class knowledge define performance.
Portal leans Optimization (Pure Optimization); WoW Classic leans Optimization (Pure Optimization).
WoW Classic leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
WoW Classic
Slower combat reduces twitch ceiling versus retail
WoW Classic leans clearly harder on reads.
Portal
No adversary modeling player.
WoW Classic
World PvP and battlegrounds involve real human prediction
WoW Classic leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
WoW Classic
Resist RNG and gear drops add meaningful hidden randomness
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.
WoW Classic
Class specs, consumable lists, and dungeon routes 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.