head to head
Grand Theft Auto V asks more than Red Dead Revolver, and the gap is reads.

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

Execution · Practiced Mastery
Arcade-style western shooter built around stage gunfights and showdown duels.
Grand Theft Auto V leans Execution (Practiced Mastery); Red Dead Revolver leans Execution (Practiced Mastery).
Red Dead Revolver leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Red Dead Revolver
Arcade gunplay and duel timing dominate
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Red Dead Revolver
Enemies are scripted shooting-gallery foes
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.
Red Dead Revolver
Minor spawn variation
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.
Red Dead Revolver
Level layouts and duel rhythms are 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.