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

Execution · Practiced Mastery
A twin-stick looter shooter blending Housemarque arcade reflexes with a loot-grind build layer.

Optimization · Practiced Mastery
Co-op first-person zombie RPG about improvised weapons on a resort island.
Alienation leans Execution (Practiced Mastery); Dead Island leans Optimization (Practiced Mastery).
Alienation leans a little harder on execution, though the gap is small.
Alienation
Twin-stick aim and dodge under heavy swarm pressure.
Dead Island
first-person melee timing and stamina
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alienation
Alien hordes never adapt.
Dead Island
zombies are scripted swarms
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alienation
Random loot cores and weapon rolls.
Dead Island
weapon drops and spawns add noise
Dead Island leans a little harder on optimization, though the gap is small.
Alienation
Build and core-socketing choices scale the endgame.
Dead Island
weapon mods and skill builds carry late game
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.