head to head
vs
Mario Kart WorldvsSplit/Second
Mario Kart World leans Execution (Twitch Chaos); Split/Second leans Execution (Pure Mechanics).
Mario Kart WorldSplit/Second
Axis by axis
Execution6 vs 8
Split/Second leans harder on execution: Drafting, drifting and dodging collapsing set pieces.
Reads4 vs 2
Mario Kart World leans harder on reads: Human racers bait items and contest lines in knockouts
Variance6 vs 4
Mario Kart World leans harder on variance: Item rolls and rubber-banding scramble any single race
Optimization4 vs 4
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.