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
An accessible action RPG of moral choices, property empires, and a loyal dog.

Optimization · Practiced Mastery
A surreal action game about rolling an ever-growing ball of everyday objects.
Fable II leans Optimization (Practiced Mastery); Katamari Damacy 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.
Fable II
One-button combat, forgiving by design
Katamari Damacy
Dual-stick rolling control, forgiving but real
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Scripted opposition
Katamari Damacy
No opposition, just clutter
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Fixed world with minor loot rolls
Katamari Damacy
Object layouts are fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Property empire and job economy trivially exploitable
Katamari Damacy
Size-growth routing through each level
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.