head to head
Grand Theft Auto V asks more than Army of Two: The Devil's Cartel, and the gap is reads.

Execution · Practiced Mastery
Straightforward cover-shooting aim against fully scripted enemy waves.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Army of Two: The Devil's Cartel leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Army of Two: The Devil's Cartel
Cover shooting rewards decent aim, nothing more
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Army of Two: The Devil's Cartel
Cartel enemies follow scripted cover AI
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Army of Two: The Devil's Cartel
Encounters replay identically
Grand Theft Auto V
Some mission and lobby randomness.
Grand Theft Auto V leans a little harder on optimization, though the gap is small.
Army of Two: The Devil's Cartel
Weapon customization adds light loadout math
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.