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

Execution · Practiced Mastery
A top-down co-op shooter testing aim against waves of mutants.

Execution · Practiced Mastery
Sprawling action horror with four campaigns and a surprisingly deep combat system.
Dead Horde leans Execution (Practiced Mastery); Resident Evil 6 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.
Dead Horde
Top-down aiming against mutant swarms is core
Resident Evil 6
Deep melee-and-gunplay movement system rewards mechanics
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Horde
Enemies are scripted hordes, nothing adapts
Resident Evil 6
Agent Hunt PvP adds a sliver of prediction
Dead Horde leans a little harder on variance, though the gap is small.
Dead Horde
Spawn directions add some unpredictability
Resident Evil 6
Set-piece campaigns are fixed after first sight
Resident Evil 6 leans a little harder on optimization, though the gap is small.
Dead Horde
Weapon choice and positioning plan survival
Resident Evil 6
Skill builds and Mercenaries combos are learnable
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.