head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; The Witcher 2: Assassins of Kings - Enhanced Edition demands more optimization.

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

Optimization · Practiced Mastery
An RPG where preparation, alchemy, and build choices outweigh raw combat reflexes.
Grand Theft Auto V leans Execution (Practiced Mastery); The Witcher 2: Assassins of Kings - Enhanced Edition leans Optimization (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
The Witcher 2: Assassins of Kings - Enhanced Edition
combat timing and dodges matter
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
The Witcher 2: Assassins of Kings - Enhanced Edition
scripted monster and human AI
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 - Enhanced Edition
alchemy and loot drops vary
The Witcher 2: Assassins of Kings - Enhanced Edition leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
The Witcher 2: Assassins of Kings - Enhanced Edition
builds and preparation are 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.
full breakdown
Grand Theft Auto V →
full breakdown
The Witcher 2: Assassins of Kings - Enhanced Edition →