head to head
Neither is simply harder - they are hard in different places. Need for Speed: World demands more execution; The Witcher 3: Wild Hunt demands more optimization.

Execution · Practiced Mastery
MMO street racing testing driving lines plus grindable car-build advantage.

Optimization · Practiced Mastery
A narrative action RPG where build planning matters more than reflex execution.
Need for Speed: World leans Execution (Practiced Mastery); The Witcher 3: Wild Hunt leans Optimization (Practiced Mastery).
Need for Speed: World leans clearly harder on execution.
Need for Speed: World
Racing lines, drift control and pursuit evasion reward clean hands
The Witcher 3: Wild Hunt
Combat timing matters but generous dodges forgive sloppy play.
Need for Speed: World leans a little harder on reads, though the gap is small.
Need for Speed: World
Human rivals in lobbies add slight positional prediction
The Witcher 3: Wild Hunt
Enemies use fixed AI behaviours; no adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: World
Pursuit spawns and lobby skill add mild noise
The Witcher 3: Wild Hunt
Loot rolls and minor combat variance only.
The Witcher 3: Wild Hunt leans clearly harder on optimization.
Need for Speed: World
Car builds, powerups and route knowledge compound advantage
The Witcher 3: Wild Hunt
Builds, alchemy, and quest routing reward planning.
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.