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 co-op mining shooter where reading randomised caves and optimising class roles carry teams through escalating bug hordes.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Deep Rock Galactic leans Execution (Practiced Mastery); Left 4 Dead leans Execution (Twitch Chaos).
Left 4 Dead leans a little harder on execution, though the gap is small.
Deep Rock Galactic
Accurate shooting and mobility across 3D cave terrain is demanding
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Left 4 Dead leans a little harder on reads, though the gap is small.
Deep Rock Galactic
Glyphids follow scripted swarm patterns, not adaptive behaviour
Left 4 Dead
Versus mode adds human ambush mindgames
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Deep Rock Galactic
Cave layouts, bug types, and secondary objectives randomise each mission
Left 4 Dead
AI Director randomizes hordes, items, and specials
Deep Rock Galactic leans a little harder on optimization, though the gap is small.
Deep Rock Galactic
Class builds, resource routing, and objective sequencing reward mastery
Left 4 Dead
Team spacing, route choice, and resource discipline
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.