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
Loot-driven sequel sending Death through sprawling dungeons to clear War's name.

Optimization · Practiced Mastery
Co-op first-person zombie RPG about improvised weapons on a resort island.
Darksiders II leans Execution (Practiced Mastery); Dead Island leans Optimization (Practiced Mastery).
Darksiders II leans a little harder on execution, though the gap is small.
Darksiders II
faster combo combat as Death
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.
Darksiders II
no adaptive opponent
Dead Island
zombies are scripted swarms
Dead Island leans a little harder on variance, though the gap is small.
Darksiders II
loot drops add light randomness
Dead Island
weapon drops and spawns add noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders II
skill trees and dungeon puzzles reward planning
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.