head to head
The Lord of the Rings: Return to Moria 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 dwarven survival-crafting expedition where managing ore, gear and bases outweighs swordplay.
Portal leans Optimization (Pure Optimization); The Lord of the Rings: Return to Moria 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: Return to Moria
Stamina-based melee needs modest timing and positioning.
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.
The Lord of the Rings: Return to Moria
Orc hordes are scripted spawns, not adaptive minds.
The Lord of the Rings: Return to Moria leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Lord of the Rings: Return to Moria
Procedurally generated mines hide ore, dangers and routes.
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Lord of the Rings: Return to Moria
Base building, gear tiers and resource chains decide survival.
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.