head to head
Tom Clancy's H.A.W.X 2 asks more than Grand Theft Auto V, and the gap is execution.

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

Execution · Practiced Mastery
An arcade-style flight combat game of aerial dogfights and ground strikes.
Grand Theft Auto V leans Execution (Practiced Mastery); Tom Clancy's H.A.W.X 2 leans Execution (Practiced Mastery).
Tom Clancy's H.A.W.X 2 leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Tom Clancy's H.A.W.X 2
flight control precision under time pressure
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Tom Clancy's H.A.W.X 2
scripted enemy squadrons, 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.
Tom Clancy's H.A.W.X 2
some mission event randomness
Tom Clancy's H.A.W.X 2 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Tom Clancy's H.A.W.X 2
loadout and maneuver routing
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.