head to head
Neither is simply harder - they are hard in different places. Crash Team Racing demands more optimization; Mario Kart World demands more variance.

Execution · Practiced Mastery
Kart racer whose boost-chaining drift system gives it a real execution ceiling.

Execution · Twitch Chaos
Kart racing blending drift execution with item RNG and pack positioning.
Crash Team Racing leans Execution (Practiced Mastery); Mario Kart World leans Execution (Twitch Chaos).
Crash Team Racing leans a little harder on execution, though the gap is small.
Crash Team Racing
Boost-chaining and drift timing separate skill tiers
Mario Kart World
Drift charging, rail grinding and shortcut precision reward hands
Mario Kart World leans a little harder on reads, though the gap is small.
Crash Team Racing
Human races involve item baiting and blocking
Mario Kart World
Human racers bait items and contest lines in knockouts
Mario Kart World leans clearly harder on variance.
Crash Team Racing
Item box rolls swing positions
Mario Kart World
Item rolls and rubber-banding scramble any single race
Crash Team Racing leans clearly harder on optimization.
Crash Team Racing
Shortcut routes and reserve-boost technique
Mario Kart World
Course knowledge, shortcuts and item management converge with study
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.