head to head
Sonic & All-Stars Racing Transformed asks more than Mario & Sonic at the London 2012 Olympic Games, and the gap is optimization.

Execution · Twitch Chaos
An Olympic minigame collection testing short bursts of motion-control timing.

Execution · Twitch Chaos
Kart racing execution moderated by item randomness and learnable track routes.
Mario & Sonic at the London 2012 Olympic Games leans Execution (Twitch Chaos); Sonic & All-Stars Racing Transformed leans Execution (Twitch Chaos).
Sonic & All-Stars Racing Transformed leans a little harder on execution, though the gap is small.
Mario & Sonic at the London 2012 Olympic Games
Waggle timing and button rhythm decide each event
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.
Mario & Sonic at the London 2012 Olympic Games
Party opponents are barely predictable or worth predicting
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.
Mario & Sonic at the London 2012 Olympic Games
Event RNG and motion-control noise add slop
Sonic & All-Stars Racing Transformed
Item rolls regularly upend race positions
Sonic & All-Stars Racing Transformed leans clearly harder on optimization.
Mario & Sonic at the London 2012 Olympic Games
Per-event tricks are learned in minutes
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.
full breakdown
Mario & Sonic at the London 2012 Olympic Games →
full breakdown
Sonic & All-Stars Racing Transformed →