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

Optimization · Practiced Mastery
A chaotic co-op action game where wizards combine eight elements into thousands of spells, often frying each other.

Execution · Practiced Mastery
A twin-stick survival game testing base-layout economy and sustained horde aim.
Magicka leans Optimization (Practiced Mastery); Yet Another Zombie Defense 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.
Magicka
Typing element combos quickly mid-combat is the hands test
Yet Another Zombie Defense
Twin-stick aim under swelling night hordes carries survival
Magicka leans a little harder on reads, though the gap is small.
Magicka
Enemies are scripted; friendly fire isn't adaptive
Yet Another Zombie Defense
Zombies beeline mindlessly, never adapting
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Magicka
Co-op friendly-fire chaos adds unpredictability
Yet Another Zombie Defense
Wave composition varies modestly between runs
Magicka leans a little harder on optimization, though the gap is small.
Magicka
Discovering and exploiting spell combinations dominates
Yet Another Zombie Defense
Turret placement and barricade economy decide how long you last
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.