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 bullet-hell roguelike where dodging fixed patterns is the core skill.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Enter the Gungeon leans Execution (Practiced Mastery); Left 4 Dead leans Execution (Twitch Chaos).
Enter the Gungeon leans a little harder on execution, though the gap is small.
Enter the Gungeon
Bullet-hell dodge-rolling and precise aim define survival.
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.
Enter the Gungeon
Bosses use fixed bullet patterns; no adaptation.
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.
Enter the Gungeon
Gun and item drops heavily randomized.
Left 4 Dead
AI Director randomizes hordes, items, and specials
Enter the Gungeon leans a little harder on optimization, though the gap is small.
Enter the Gungeon
Synergy hunting and shop routing shape strong runs.
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.