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
A Revolution-era Paris entry built around dense crowds and open-ended blackbox assassinations.

Execution · Practiced Mastery
Gravity-shifting action adventure about falling sideways through a floating city.
Assassin's Creed Unity leans Optimization (Practiced Mastery); Gravity Rush leans Execution (Practiced Mastery).
Gravity Rush leans a little harder on execution, though the gap is small.
Assassin's Creed Unity
Refined parkour, still forgiving combat
Gravity Rush
Aerial gravity-kick aiming takes spatial control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Unity
Co-op partners face scripted guards
Gravity Rush
Nevi 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 Unity
Fixed sandbox assassinations
Gravity Rush
Authored world, minimal randomness
Assassin's Creed Unity leans a little harder on optimization, though the gap is small.
Assassin's Creed Unity
Gear builds and blackbox approach planning
Gravity Rush
Gem farming and upgrade priorities
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.