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

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
An anarchic open-world crime sandbox about rebuilding the Saints and reclaiming Stilwater.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Saints Row 2 leans Execution (Practiced Mastery).
Saints Row 2 leans a little harder on execution, though the gap is small.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Saints Row 2
Gunfights, driving, and activity minigames test moderate dexterity
Saints Row 2 leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Saints Row 2
Gang AI follows simple fixed behaviour
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Saints Row 2
Sandbox chaos adds mild unpredictability
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Saints Row 2
Respect economy, stronghold takeovers, and activity completion are systematic
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.