head to head
The Lord of the Rings Online asks more than Portal, and the gap is variance.

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

Optimization · Pure Optimization
A lore-faithful MMORPG where trait tree builds and fellowship coordination decide raid performance.
Portal leans Optimization (Pure Optimization); The Lord of the Rings Online leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Portal placement timing modest.
The Lord of the Rings Online
Raid content has limited twitch demand versus action MMOs
The Lord of the Rings Online leans clearly harder on reads.
Portal
No adversary modeling player.
The Lord of the Rings Online
Mostly PvMP monster play; rarely the main loop
The Lord of the Rings Online leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Lord of the Rings Online
Loot RNG and deed completion add minor hidden layers
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Lord of the Rings Online
Trait trees and fellowship manoeuvres are systematically optimised
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.