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
Stealth route planning through scripted guards with a forgiving execution floor.

Execution · Practiced Mastery
Linear postwar crime story driven by cover shootouts and atmosphere.
Assassin's Creed: Liberation HD leans Optimization (Practiced Mastery); Mafia II leans Execution (Practiced Mastery).
Mafia II leans a little harder on execution, though the gap is small.
Assassin's Creed: Liberation HD
Forgiving parkour and counter-based combat
Mafia II
Cover shooting and fistfight timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Liberation HD
Guard AI runs simple fixed routines
Mafia II
Enemies are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Liberation HD
Patrols and objectives are static once scouted
Mafia II
Story missions are fixed
Assassin's Creed: Liberation HD leans a little harder on optimization, though the gap is small.
Assassin's Creed: Liberation HD
Persona system and stealth routing are the real layer
Mafia II
Modest; learning encounter layouts
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.