head to head
vs
GripvsLeft 4 Dead
Grip leans Execution (Pure Mechanics); Left 4 Dead leans Execution (Twitch Chaos).
GripLeft 4 Dead
Axis by axis
Execution7 vs 7
Even - both lean on execution about the same.
Reads2 vs 2
Even - both lean on reads about the same.
Variance4 vs 5
Left 4 Dead leans harder on variance: AI Director randomizes hordes, items, and specials
Optimization4 vs 5
Left 4 Dead leans harder on optimization: Team spacing, route choice, and resource discipline
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.