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 · Twitch Chaos
A kart racer about precise driving and timing random powerups against rivals.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Beach Buggy Racing leans Execution (Twitch Chaos); Left 4 Dead leans Execution (Twitch Chaos).
Left 4 Dead leans a little harder on execution, though the gap is small.
Beach Buggy Racing
Steering and drifting precision carries races
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Beach Buggy Racing
AI racers follow scripted lines, not adaptive prediction
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.
Beach Buggy Racing
Random powerup drops swing race outcomes
Left 4 Dead
AI Director randomizes hordes, items, and specials
Left 4 Dead leans a little harder on optimization, though the gap is small.
Beach Buggy Racing
Car upgrades and powerup timing form a light layer
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.