head to head
Divinity: Original Sin 2 asks more than Path of Exile, and the gap is reads.

Optimization · Pure Optimization
A deeply optimizable tactical RPG where armor stripping and initiative manipulation produce near-deterministic victories.

Optimization · Pure Optimization
A theorycraft-dense ARPG about engineering builds through randomised loot and crafting.
Divinity: Original Sin 2 leans Optimization (Pure Optimization); Path of Exile leans Optimization (Pure Optimization).
Path of Exile leans a little harder on execution, though the gap is small.
Divinity: Original Sin 2
Turn-based system demands zero reaction speed or motor precision
Path of Exile
Some dodge and reflex play, but build carries fights.
Divinity: Original Sin 2 leans clearly harder on reads.
Divinity: Original Sin 2
Multiplayer PvP arena adds light opponent-reading; solo is scripted
Path of Exile
Mobs and bosses are scripted; no adaptation.
Path of Exile leans a little harder on variance, though the gap is small.
Divinity: Original Sin 2
Source point limits and hidden enemy armor values create unknowns
Path of Exile
Loot, map mods, and crafting outcomes are heavily random.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Divinity: Original Sin 2
Lone Wolf builds and damage-type stacking define solved optimal strategies
Path of Exile
Passive tree, crafting, and economy form near-infinite theorycraft.
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.