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
Linear sci-fi shooting plus spatial puzzles with fixed solutions.

Execution · Practiced Mastery
An accessible open-world heist fantasy with forgiving stealth and shooting.
Prey leans Execution (Practiced Mastery); Star Wars Outlaws 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.
Prey
Standard FPS aim with portal disorientation added
Star Wars Outlaws
Blaster combat and stealth need only moderate precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Prey
Alien enemies follow fixed scripts
Star Wars Outlaws
Guards and syndicates run scripted detection routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Prey
Linear campaign with little randomness
Star Wars Outlaws
Open-world content is fixed once discovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Prey
Portal and gravity puzzles have fixed solutions
Star Wars Outlaws
Reputation juggling and gear upgrades are a light systems layer
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.