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

Optimization · Practiced Mastery
Memorising and rapidly inputting spell recipes while dodging your own friends.

Optimization · Practiced Mastery
An action RPG where leveling means choosing which Londoners to drain.
Magicka 2 leans Optimization (Practiced Mastery); Vampyr leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Magicka 2
Typing element combos quickly mid-fight is the skill ceiling
Vampyr
Dodge-and-stamina melee combat with modest demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Magicka 2
Enemies are scripted; friendly-fire chaos is not prediction
Vampyr
Enemies follow scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Magicka 2
Co-op misfires add slapstick randomness, little else
Vampyr
Citizen secrets are hidden until investigated
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Magicka 2
Knowing the strongest spell recipes trivialises encounters
Vampyr
The feed-or-spare XP economy is the central solvable system
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.