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
CD Projekt's first RPG, a dark fantasy of monster contracts and morally gray choices.

Optimization · Pure Optimization
A class-swapping JRPG carried by art-rotation and ouroboros build optimization.
The Witcher leans Optimization (Pure Optimization); Xenoblade Chronicles 3 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.
The Witcher
Rhythm-click combat needs only loose timing
Xenoblade Chronicles 3
Auto-attack with art-timing inputs
Xenoblade Chronicles 3 leans a little harder on reads, though the gap is small.
The Witcher
Enemies follow fixed styles and weaknesses
Xenoblade Chronicles 3
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Witcher
Some unknown quest outcomes on first play
Xenoblade Chronicles 3
Loot and gem rolls
Xenoblade Chronicles 3 leans a little harder on optimization, though the gap is small.
The Witcher
Signs, potions, and style matchups form the real game
Xenoblade Chronicles 3
Class, art, and ouroboros builds deeply rewarded
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.