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
Co-op first-person zombie RPG about improvised weapons on a resort island.

Optimization · Practiced Mastery
Episodic survival horror aboard a derelict cruise ship, with a loot-driven Raid Mode.
Dead Island leans Optimization (Practiced Mastery); Resident Evil Revelations 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.
Dead Island
first-person melee timing and stamina
Resident Evil Revelations
Aiming under pressure matters in tight corridors
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
zombies are scripted swarms
Resident Evil Revelations
Ooze enemies are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
weapon drops and spawns add noise
Resident Evil Revelations
Scanner pickups and ambushes surprise first run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
weapon mods and skill builds carry late game
Resident Evil Revelations
Raid Mode builds and weapon customization reward planning
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.