head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Twitch Chaos
Item-heavy kart racing testing track knowledge against ACME-flavoured randomness.

Execution · Twitch Chaos
Kart racing execution moderated by item randomness and learnable track routes.
Looney Tunes Racing 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.
Looney Tunes Racing
Cornering and boost timing carry the racing
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.
Looney Tunes Racing
Mild item mindgames against human players
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.
Looney Tunes Racing
ACME item rolls randomise each race's chaos
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.
Looney Tunes Racing
Track memorisation and shortcut routing pay off
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.