head to head
Warhammer 40,000: Darktide asks more than Grand Theft Auto V, and the gap is variance.

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

Execution · Practiced Mastery
40k co-op horde shooter with class builds.
Grand Theft Auto V leans Execution (Practiced Mastery); Warhammer 40,000: Darktide leans Execution (Practiced Mastery).
Warhammer 40,000: Darktide leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Warhammer 40,000: Darktide
Melee-gunplay weaving under horde pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Warhammer 40,000: Darktide
Scripted specials, not adaptive opponents
Warhammer 40,000: Darktide leans clearly harder on variance.
Grand Theft Auto V
Some mission and lobby randomness.
Warhammer 40,000: Darktide
Director spawns and weapon rolls vary
Warhammer 40,000: Darktide leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Warhammer 40,000: Darktide
Talent trees and breakpoints heavily solved
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.