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

Execution · Practiced Mastery
The sequel that turned LittleBigPlanet's creator into a full game-making toolset.

Execution · Practiced Mastery
Linear sci-fi shooting plus spatial puzzles with fixed solutions.
LittleBigPlanet 2 leans Execution (Practiced Mastery); Prey leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
LittleBigPlanet 2
Floaty platforming and grappling demand adjustment
Prey
Standard FPS aim with portal disorientation added
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
LittleBigPlanet 2
No adaptive opposition
Prey
Alien enemies follow fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
LittleBigPlanet 2
Fixed levels
Prey
Linear campaign with little randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
LittleBigPlanet 2
Score multipliers and collectible routing
Prey
Portal and gravity puzzles have fixed solutions
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.