head to head
Arma 3 asks more than Natural Selection 2, and the gap is variance.

Execution · Grand Arena
Open military simulator and PvP sandbox.

Execution · Grand Arena
Asymmetric FPS-RTS hybrid where aliens and marines fight under live human commanders.
Arma 3 leans Execution (Grand Arena); Natural Selection 2 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 3
Bullet drop, stance, sway, weight all matter
Natural Selection 2
Skulk movement and marine aim have steep ceilings
Arma 3 leans a little harder on reads, though the gap is small.
Arma 3
PvP and milsim ops reward prediction
Natural Selection 2
Human commanders mind-game tech and map control
Arma 3 leans clearly harder on variance.
Arma 3
Mission scripts and AI behavior vary
Natural Selection 2
Symmetric maps, little randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 3
Loadout planning and tactics solvable
Natural Selection 2
Tech trees, res flow, and lifeform timings
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.