head to head
The Witcher 2: Assassins of Kings asks more than Grand Theft Auto V, and the gap is optimization.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Optimization · Practiced Mastery
A demanding action RPG where dodge timing meets alchemy build planning.
Grand Theft Auto V leans Execution (Practiced Mastery); The Witcher 2: Assassins of Kings leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Driving and shooting demand decent inputs.
The Witcher 2: Assassins of Kings
Tight dodge and parry windows
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
The Witcher 2: Assassins of Kings
Scripted enemy patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Some mission and lobby randomness.
The Witcher 2: Assassins of Kings
Some loot and alchemy variance
The Witcher 2: Assassins of Kings leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
The Witcher 2: Assassins of Kings
Sign, alchemy, and skill builds matter
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.