head to head
Neither is simply harder - they are hard in different places. Baldur's Gate demands more variance; Portal demands more execution.

Optimization · Pure Optimization
The classic AD&D CRPG where party planning beats dice luck over time.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Baldur's Gate leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Baldur's Gate
Pause-and-play needs minimal dexterity.
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.
Baldur's Gate
Scripted encounters, no adaptation.
Portal
No adversary modeling player.
Baldur's Gate leans clearly harder on variance.
Baldur's Gate
AD&D dice rolls throughout.
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Baldur's Gate
Party builds and encounter prep solvable.
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.