head to head
Destiny 2 asks more than Grand Theft Auto V, and the gap is optimization.

Optimization · Practiced Mastery
A looter shooter where build optimization gates raid and seasonal content.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Destiny 2 leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Destiny 2 leans a little harder on execution, though the gap is small.
Destiny 2
Gunplay matters but raids forgive mechanics.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Destiny 2
PvE is scripted; Crucible has light adaptation.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Destiny 2 leans clearly harder on variance.
Destiny 2
Loot drops and rolls drive the chase.
Grand Theft Auto V
Some mission and lobby randomness.
Destiny 2 leans clearly harder on optimization.
Destiny 2
Build crafting, mods, and damage rotations dominate.
Grand Theft Auto V
Heists, money loops, builds learnable.
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.