head to head
Silent Hill: Origins 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 prequel horror story built on mirror-world traversal and disposable melee weapons.
Portal leans Optimization (Pure Optimization); Silent Hill: Origins leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
Silent Hill: Origins
Breakable-weapon melee asks little precision
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.
Silent Hill: Origins
Enemies are scripted patterns
Silent Hill: Origins leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Silent Hill: Origins
Hidden layouts and mirror-world switches surprise once
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Silent Hill: Origins
Weapon inventory and puzzle routes converge quickly
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.