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

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
Preparation-driven RPG combat where potions, builds and monster knowledge beat reflexes.
Fallout: New Vegas leans Optimization (Pure Optimization); The Witcher: Enhanced Edition Director's Cut leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
The Witcher: Enhanced Edition Director's Cut
Rhythm-click combat is timing-light and forgiving
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
The Witcher: Enhanced Edition Director's Cut
Enemies follow fixed behaviours, nothing adapts to you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Some loot and crit RNG
The Witcher: Enhanced Edition Director's Cut
Quest outcomes are scripted-but-unknown on a first playthrough
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
The Witcher: Enhanced Edition Director's Cut
Alchemy prep, signs and talent builds decide every fight
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.