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

Execution · Practiced Mastery
Tests kart-racing line execution across three vehicle types with item luck on top.

Execution · Twitch Chaos
Kart racing execution moderated by item randomness and learnable track routes.
Diddy Kong Racing DS leans Execution (Practiced Mastery); Sonic & All-Stars Racing Transformed leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing DS
Drift boosting across car, hover and plane handling
Sonic & All-Stars Racing Transformed
Drift timing and transforming vehicle control reward practice
Sonic & All-Stars Racing Transformed leans a little harder on reads, though the gap is small.
Diddy Kong Racing DS
AI rivals are scripted; multiplayer prediction stays shallow
Sonic & All-Stars Racing Transformed
Human racers add light positional mind games
Sonic & All-Stars Racing Transformed leans a little harder on variance, though the gap is small.
Diddy Kong Racing DS
Balloon item pickups swing race positions
Sonic & All-Stars Racing Transformed
Item rolls regularly upend race positions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing DS
Zipper routes and vehicle choice per track are learnable
Sonic & All-Stars Racing Transformed
Track shortcuts and drift-boost routes are learnable
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.