head to head
vs
Battlefield 4vsNatural Selection 2
Battlefield 4 leans Execution (Competitive PvP); Natural Selection 2 leans Execution (Grand Arena).
Battlefield 4Natural Selection 2
Axis by axis
Execution7 vs 8
Natural Selection 2 leans harder on execution: Skulk movement and marine aim have steep ceilings
Reads5 vs 6
Natural Selection 2 leans harder on reads: Human commanders mind-game tech and map control
Variance3 vs 2
Battlefield 4 leans harder on variance: Map-altering events and spawns inject noise
Optimization5 vs 6
Natural Selection 2 leans harder on optimization: Tech trees, res flow, and lifeform timings
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.