head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Stealth route planning through scripted guards with a forgiving execution floor.

Optimization · Practiced Mastery
A forgiving fantasy RPG testing light build and morality-system optimization.
Assassin's Creed: Liberation HD leans Optimization (Practiced Mastery); Fable: The Lost Chapters 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.
Assassin's Creed: Liberation HD
Forgiving parkour and counter-based combat
Fable: The Lost Chapters
Forgiving combat needs little precision
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
Fable: The Lost Chapters
Enemies and villagers run simple scripts
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
Fable: The Lost Chapters
The authored world holds few surprises after one pass
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
Fable: The Lost Chapters
Alignment, builds and economy are a gentle solvable layer
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.