head to head
Not a Hero asks more than Grand Theft Auto V, and the gap is execution.

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

Execution · Practiced Mastery
Twitchy cover-shooter rooms that reward drilled execution and memorised routes.
Grand Theft Auto V leans Execution (Practiced Mastery); Not a Hero leans Execution (Practiced Mastery).
Not a Hero leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Not a Hero
Slide-cancels, snap cover and reload timing decide every room
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.
Not a Hero
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.
Grand Theft Auto V
Some mission and lobby randomness.
Not a Hero
Minor enemy spawn jitter, levels otherwise deterministic
Not a Hero leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Not a Hero
Learning room layouts and routing kills enables full-clear runs
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.