head to head
Baldur's Gate 3 asks more than Diablo II, and the gap is reads.

Optimization · Systems & Chaos
A D&D CRPG where build optimization and dice variance dominate every encounter.

Optimization · Pure Optimization
The genre-defining loot ARPG whose builds, runes, and trade economy players still optimize decades later.
Baldur's Gate 3 leans Optimization (Systems & Chaos); Diablo II leans Optimization (Pure Optimization).
Diablo II leans a little harder on execution, though the gap is small.
Baldur's Gate 3
Turn-based; no input dexterity.
Diablo II
Positioning and potion reflexes, little else physical
Baldur's Gate 3 leans clearly harder on reads.
Baldur's Gate 3
Companions/enemies scripted, not adaptive to player modeling.
Diablo II
Monster AI is fully mappable
Baldur's Gate 3 leans a little harder on variance, though the gap is small.
Baldur's Gate 3
Dice rolls, hidden checks, encounter RNG everywhere.
Diablo II
Loot RNG and random maps drive the grind
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Baldur's Gate 3
Builds, party comp, action economy fully solvable.
Diablo II
Builds, breakpoints, rune economy, magic-find routing are the game
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.