head to head
Grand Theft Auto V asks more than Shadowgrounds, and the gap is reads.

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

Execution · Practiced Mastery
Top-down aim and kiting against scripted alien swarms with light upgrade planning.
Grand Theft Auto V leans Execution (Practiced Mastery); Shadowgrounds leans Execution (Practiced Mastery).
Shadowgrounds leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Shadowgrounds
Kiting alien swarms top-down rewards steady aim and movement
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Shadowgrounds
Aliens charge on simple scripts, never modelling 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.
Shadowgrounds
Ambush triggers are scripted-but-unknown on first playthrough
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Heists, money loops, builds learnable.
Shadowgrounds
Weapon upgrade routing is a light solvable layer
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.