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
An open-world revenge tale where a new shapeshifter hunts Alex Mercer through plague-zoned New York.
Execution · Practiced Mastery
Aiming under pressure while learning fixed demon patterns and light-versus-dark puzzle rules.
Prototype 2 leans Execution (Practiced Mastery); Shadows of the Damned 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.
Prototype 2
Power-swapping combat and traversal demand decent dexterity
Shadows of the Damned
Third-person aim and dodge timing carry every demon fight
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Prototype 2
Blackwatch and infected never adapt
Shadows of the Damned
Demons and bosses run fixed patterns, nothing adapts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Prototype 2
Sandbox encounters carry slight randomness
Shadows of the Damned
Encounters are scripted; little randomness once seen
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Prototype 2
Mutation upgrades and target-hunting routes reward planning
Shadows of the Damned
Learning boss patterns and light-dark mechanics solves each fight
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.