head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Practiced Mastery
First-person parkour against zombies, especially terrifying after dark.

Execution · Practiced Mastery
Third-person action where Captain Titus chainswords through ork hordes without a cover system.
Dying Light leans Execution (Practiced Mastery); Warhammer 40,000: Space Marine 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.
Dying Light
Parkour traversal and melee timing demanding.
Warhammer 40,000: Space Marine
Melee-shooting flow and execution timing carry combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dying Light
Zombie AI scripted, non-adaptive.
Warhammer 40,000: Space Marine
Ork hordes follow scripted aggression
Dying Light leans a little harder on variance, though the gap is small.
Dying Light
Night-hunter encounters bring randomness.
Warhammer 40,000: Space Marine
Encounters are fixed and predictable
Dying Light leans a little harder on optimization, though the gap is small.
Dying Light
Crafting, blueprints, skill trees solvable.
Warhammer 40,000: Space Marine
Weapon choice and fury management are simple to learn
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.