head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
Deep tactical build crafting and elemental combo solving across set-piece turn-based encounters.

Optimization · Pure Optimization
A pure optimization exercise where sphere grid planning and boss weakness exploitation defines mastery.
Divinity: Original Sin II - Definitive Edition leans Optimization (Pure Optimization); Final Fantasy X leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Divinity: Original Sin II - Definitive Edition
Turn-based combat removes any physical ceiling
Final Fantasy X
Fully turn-based; zero time pressure on inputs
Divinity: Original Sin II - Definitive Edition leans a little harder on reads, though the gap is small.
Divinity: Original Sin II - Definitive Edition
Optional PvP arena aside, AI follows mappable behaviour
Final Fantasy X
All aeons and fiends operate on fixed AI scripts
Divinity: Original Sin II - Definitive Edition leans a little harder on variance, though the gap is small.
Divinity: Original Sin II - Definitive Edition
Initiative rolls, random loot and unknown encounters add spice
Final Fantasy X
Minimal RNG in base game; overdrive gauge charges predictably
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Divinity: Original Sin II - Definitive Edition
Build synergies, surface combos and positioning are deeply solvable
Final Fantasy X
Sphere Grid routing and break damage limits make the game theoretically 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.