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

Execution · Twitch Chaos
Arcade stock-car driving where random power-ups keep races scrambled.

Execution · Twitch Chaos
Kart racing execution moderated by item randomness and learnable track routes.
NASCAR Rumble leans Execution (Twitch Chaos); 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.
NASCAR Rumble
Arcade handling at speed still rewards clean driving
Sonic & All-Stars Racing Transformed
Drift timing and transforming vehicle control reward practice
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
NASCAR Rumble
Split-screen rivals can be baited with items
Sonic & All-Stars Racing Transformed
Human racers add light positional mind games
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
NASCAR Rumble
Power-up pickups scramble race outcomes constantly
Sonic & All-Stars Racing Transformed
Item rolls regularly upend race positions
Sonic & All-Stars Racing Transformed leans a little harder on optimization, though the gap is small.
NASCAR Rumble
Track shortcuts and item timing are learnable edges
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.