head to head
Grand Theft Auto V asks more than Just Cause 4, and the gap is reads.

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

Execution · Practiced Mastery
An open-world chaos sandbox adding tornado weather to grappling-hook anarchy.
Grand Theft Auto V leans Execution (Practiced Mastery); Just Cause 4 leans Execution (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Just Cause 4
Wingsuit and customised tether handling
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Just Cause 4
Enemy AI is static
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.
Just Cause 4
Weather fronts shake encounters up slightly
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.
Just Cause 4
Frontline progression and loadout tinkering
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.