head to head
Fallout 76 asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A live-service Fallout where perk-card builds and CAMP crafting drive progression.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Fallout 76 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.
Fallout 76
Shooter inputs in live combat
Portal
Portal placement timing modest.
Fallout 76 leans clearly harder on reads.
Fallout 76
PvP exists but most play is PvE
Portal
No adversary modeling player.
Fallout 76 leans clearly harder on variance.
Fallout 76
Legendary and event loot rolls
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Fallout 76
Perk cards, CAMP, build crafting key
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.