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

Execution · Practiced Mastery
Linear postwar crime story driven by cover shootouts and atmosphere.

Execution · Practiced Mastery
Tests casual open-world chaos appetite more than any skill axis.
Mafia II leans Execution (Practiced Mastery); Saints Row 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.
Mafia II
Cover shooting and fistfight timing
Saints Row
Forgiving shooting and driving demand little precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia II
Enemies are scripted
Saints Row
Gang AI runs simple fixed scripts
Saints Row leans a little harder on variance, though the gap is small.
Mafia II
Story missions are fixed
Saints Row
Open-world events vary mildly between sessions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia II
Modest; learning encounter layouts
Saints Row
Perks, weapons and venture economy reward light planning
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.