head to head
Eye of the Beholder III: Assault on Myth Drannor asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A first-person dungeon RPG testing party building and dungeon-mapping strategy.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Eye of the Beholder III: Assault on Myth Drannor leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Eye of the Beholder III: Assault on Myth Drannor
Real-time clicks matter but party-based, not twitch
Portal
Portal placement timing modest.
Eye of the Beholder III: Assault on Myth Drannor leans a little harder on reads, though the gap is small.
Eye of the Beholder III: Assault on Myth Drannor
Monsters follow scripted behavior
Portal
No adversary modeling player.
Eye of the Beholder III: Assault on Myth Drannor leans clearly harder on variance.
Eye of the Beholder III: Assault on Myth Drannor
AD&D dice rolls add randomness
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.
Eye of the Beholder III: Assault on Myth Drannor
Party building, spell management and dungeon mapping lead
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.