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.

Optimization · Practiced Mastery
A Revolution-era Paris entry built around dense crowds and open-ended blackbox assassinations.
Assassin's Creed: Liberation HD leans Optimization (Practiced Mastery); Assassin's Creed Unity leans Optimization (Practiced Mastery).
Assassin's Creed Unity leans a little harder on execution, though the gap is small.
Assassin's Creed: Liberation HD
Forgiving parkour and counter-based combat
Assassin's Creed Unity
Refined parkour, still forgiving combat
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
Assassin's Creed Unity
Co-op partners face scripted guards
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
Assassin's Creed Unity
Fixed sandbox assassinations
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Liberation HD
Persona system and stealth routing are the real layer
Assassin's Creed Unity
Gear builds and blackbox approach 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.