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

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

Optimization · Practiced Mastery
A family-friendly open-world driving adventure romping through Springfield's mystery of cameras and cola.
Mafia II leans Execution (Practiced Mastery); The Simpsons: Hit & Run leans Optimization (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
The Simpsons: Hit & Run
Forgiving driving and light platforming
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
The Simpsons: Hit & Run
No adaptive opposition exists
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mafia II
Story missions are fixed
The Simpsons: Hit & Run
Fixed missions with trivial traffic noise
The Simpsons: Hit & Run leans a little harder on optimization, though the gap is small.
Mafia II
Modest; learning encounter layouts
The Simpsons: Hit & Run
Mission routes, shortcuts, and collectible runs are solvable
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.