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 radio-controlled car racer through houses and supermarkets with weapon pickups and hidden shortcuts.

Execution · Twitch Chaos
Kart racing execution moderated by item randomness and learnable track routes.
Re-Volt leans Execution (Pure Mechanics); Sonic & All-Stars Racing Transformed leans Execution (Twitch Chaos).
Re-Volt leans a little harder on execution, though the gap is small.
Re-Volt
Twitchy RC car handling punishes sloppy steering
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.
Re-Volt
Multiplayer item duels add a thin mind-game layer
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.
Re-Volt
Random pickups swing race outcomes
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.
Re-Volt
Shortcuts and car-class knowledge reward study
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.