head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Grand Arena
Asymmetric FPS-RTS hybrid where aliens and marines fight under live human commanders.

Execution · Grand Arena
Team hero shooter blending FPS mechanics with ability economy mind games.
Natural Selection 2 leans Execution (Grand Arena); Overwatch 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.
Natural Selection 2
Skulk movement and marine aim have steep ceilings
Overwatch
Hero aim, movement, and ability timing
Overwatch leans a little harder on reads, though the gap is small.
Natural Selection 2
Human commanders mind-game tech and map control
Overwatch
Ult tracking, flanks, and baiting human teams
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Natural Selection 2
Symmetric maps, little randomness
Overwatch
Minor spread and matchmaking noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Natural Selection 2
Tech trees, res flow, and lifeform timings
Overwatch
Team comps, ult economy, and positioning theory
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.