head to head
vs
Far Cry PrimalvsLeft 4 Dead
Far Cry Primal leans Execution (Practiced Mastery); Left 4 Dead leans Execution (Twitch Chaos).
Far Cry PrimalLeft 4 Dead
Axis by axis
Execution6 vs 7
Left 4 Dead leans harder on execution: Headshots, melee shoves, and special-infected reaction time
Reads1 vs 2
Left 4 Dead leans harder on reads: Versus mode adds human ambush mindgames
Variance3 vs 5
Left 4 Dead leans harder on variance: AI Director randomizes hordes, items, and specials
Optimization5 vs 5
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.