head to head
vs
Left 4 Dead 2vsUnturned
Left 4 Dead 2 leans Execution (Practiced Mastery); Unturned leans Optimization (Practiced Mastery).
Left 4 Dead 2Unturned
Axis by axis
Execution6 vs 5
Left 4 Dead 2 leans harder on execution: Headshots under horde pressure need aim
Reads3 vs 4
Unturned leans harder on reads: Human raiders and ambushes on PvP servers
Variance5 vs 5
Even - both lean on variance about the same.
Optimization6 vs 6
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.