head to head
Unturned 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.

Optimization · Practiced Mastery
A blocky free-to-play zombie survival sandbox mixing scavenging, basebuilding, and PvP.
Grand Theft Auto V leans Execution (Practiced Mastery); Unturned leans Optimization (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.
Unturned
Gunfights and driving reward aim and control
Unturned leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Unturned
Human raiders and ambushes on PvP servers
Unturned leans clearly harder on variance.
Grand Theft Auto V
Some mission and lobby randomness.
Unturned
Loot spawns and unknown player positions
Unturned leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Unturned
Base building, loot routes, and crafting economy
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.