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
Aging Ezio chases Altair's legacy through Constantinople in the trilogy's closer.

Execution · Practiced Mastery
A Pixar-styled action adventure about a spirit guide cleansing a corrupted forest.
Assassin's Creed Revelations leans Optimization (Practiced Mastery); Kena: Bridge of Spirits leans Execution (Practiced Mastery).
Kena: Bridge of Spirits leans a little harder on execution, though the gap is small.
Assassin's Creed Revelations
Hookblade traversal and forgiving counters
Kena: Bridge of Spirits
Parry and dodge timing in boss fights
Assassin's Creed Revelations leans a little harder on reads, though the gap is small.
Assassin's Creed Revelations
Multiplayer hide-and-hunt kept human bluffing
Kena: Bridge of Spirits
Corrupted spirits are fully 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 Revelations
Fixed missions
Kena: Bridge of Spirits
World is fixed and explorable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Revelations
Den defense and city investment systems
Kena: Bridge of Spirits
Rot ability usage and boss pattern learning
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.