head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
A competitive kart racer testing drift-boost execution against human rivals.

Execution · Pure Mechanics
Battle royale Tetris where raw stacking speed decides who outlasts 98 opponents.
Crazyracing Kartrider leans Execution (Pure Mechanics); Tetris 99 leans Execution (Pure Mechanics).
Tetris 99 leans a little harder on execution, though the gap is small.
Crazyracing Kartrider
Drift-boost timing and tight cornering define lap speed
Tetris 99
High-speed stacking and finesse define survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crazyracing Kartrider
Reading rival lines and item timing matters in PvP
Tetris 99
Targeting and badge timing against humans matter mid-match
Tetris 99 leans a little harder on variance, though the gap is small.
Crazyracing Kartrider
Item pickups add some randomness to races
Tetris 99
Incoming garbage timing and piece sequence add chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Crazyracing Kartrider
Track lines, drift chaining, and item usage are solvable
Tetris 99
Stacking theory and downstack efficiency are studied skills
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.