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.

Execution · Practiced Mastery
Gravity-shifting action adventure about falling sideways through a floating city.

Execution · Practiced Mastery
Story-driven action adventure carried by its banter more than its combat depth.
Gravity Rush leans Execution (Practiced Mastery); Marvel's Guardians of the Galaxy leans Execution (Practiced Mastery).
Gravity Rush leans a little harder on execution, though the gap is small.
Gravity Rush
Aerial gravity-kick aiming takes spatial control
Marvel's Guardians of the Galaxy
third-person shooting with generous checkpoints
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Gravity Rush
Nevi enemies are scripted
Marvel's Guardians of the Galaxy
enemies follow fixed behaviors
Marvel's Guardians of the Galaxy leans a little harder on variance, though the gap is small.
Gravity Rush
Authored world, minimal randomness
Marvel's Guardians of the Galaxy
story beats unknown only on first playthrough
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Gravity Rush
Gem farming and upgrade priorities
Marvel's Guardians of the Galaxy
ability priorities and huddle timing are light systems
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.