head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Execution · Practiced Mastery
A gleefully absurd open-world crime game where the Saints conquer Steelport as celebrity gangsters.
Grand Theft Auto V leans Execution (Practiced Mastery); Saints Row: The Third 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.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Saints Row: The Third
Generous shooting and driving keep the skill bar moderate
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.
Saints Row: The Third
Enemy syndicates never adapt to you
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.
Saints Row: The Third
Sandbox mayhem injects light randomness
Saints Row: The Third leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Saints Row: The Third
Upgrade trees and city-takeover income are straightforwardly maximised
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.