head to head
Helldivers 2 asks more than Lethal Company, and the gap is execution.

Optimization · Practiced Mastery
Top-tier co-op shooter against bug and bot hordes.

Variance · Systems & Chaos
A co-op horror about scavenging scrap on hostile moons for a quota.
Helldivers 2 leans Optimization (Practiced Mastery); Lethal Company leans Variance (Systems & Chaos).
Helldivers 2 leans clearly harder on execution.
Helldivers 2
Recoil, stratagem inputs, friendly-fire aim
Lethal Company
Movement and aim matter under pressure.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Helldivers 2
Enemies scripted, no adaptive opponent
Lethal Company
Other players coordinate, but enemies scripted.
Lethal Company leans a little harder on variance, though the gap is small.
Helldivers 2
Patrol spawns and modifiers shake missions
Lethal Company
Moon layouts and monster spawns randomize.
Helldivers 2 leans a little harder on optimization, though the gap is small.
Helldivers 2
Loadout and stratagem synergies deep
Lethal Company
Quota routing and loadouts 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.