head to head
Metal Gear Survive asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A survival-crafting loop where resource budgeting matters more than combat skill.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Metal Gear Survive leans Optimization (Pure Optimization); Portal 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.
Metal Gear Survive
Spear-and-fence combat is deliberate, not twitchy
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Survive
Wanderers are mindless scripted zombies
Portal
No adversary modeling player.
Metal Gear Survive leans clearly harder on variance.
Metal Gear Survive
Dust exploration hides resources until scouted
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Metal Gear Survive
Base-building, crafting chains and resource budgeting carry survival
Portal
Pure puzzle-solving optimization.
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.