head to head
Grand Theft Auto V asks more than Halo: Spartan Strike, and the gap is reads.

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

Execution · Practiced Mastery
A top-down twin-stick shooter set in the Halo universe.
Grand Theft Auto V leans Execution (Practiced Mastery); Halo: Spartan Strike leans Execution (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.
Halo: Spartan Strike
twin-stick aiming and dodging matters
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Halo: Spartan Strike
scripted enemy AI, not adaptive
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.
Halo: Spartan Strike
some enemy spawn randomness
Halo: Spartan Strike leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Halo: Spartan Strike
loadout and mission-route optimization
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.