head to head
Neither is simply harder - they are hard in different places. Alien: Isolation demands more execution; Baldur's Gate 3 demands more optimization.

Variance · Systems & Chaos
A stealth horror where an unpredictable hunter forces hidden-information play.

Optimization · Systems & Chaos
A D&D CRPG where build optimization and dice variance dominate every encounter.
Alien: Isolation leans Variance (Systems & Chaos); Baldur's Gate 3 leans Optimization (Systems & Chaos).
Alien: Isolation leans clearly harder on execution.
Alien: Isolation
Stealth movement, low mechanical bar
Baldur's Gate 3
Turn-based; no input dexterity.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alien: Isolation
Alien has heuristics but doesn't truly model you
Baldur's Gate 3
Companions/enemies scripted, not adaptive to player modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alien: Isolation
Alien's director behavior is hidden and unpredictable
Baldur's Gate 3
Dice rolls, hidden checks, encounter RNG everywhere.
Baldur's Gate 3 leans clearly harder on optimization.
Alien: Isolation
Resource crafting and route planning help survive
Baldur's Gate 3
Builds, party comp, action economy fully solvable.
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.