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 · Twitch Chaos
N64 couch classic where blue shells and shortcuts decide friendships.

Execution · Twitch Chaos
A high-speed kart racer where team wisps and item variance sit atop a technique layer.
Mario Kart 64 leans Execution (Twitch Chaos); Sonic Racing CrossWorlds 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.
Mario Kart 64
Mini-turbo snaking and shortcut execution
Sonic Racing CrossWorlds
Speed-type technique and boost activation have a real ceiling
Mario Kart 64 leans a little harder on reads, though the gap is small.
Mario Kart 64
Couch rivals bait shells and fakes
Sonic Racing CrossWorlds
Online races require light item-anticipation modelling
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 64
Item draws swing every race
Sonic Racing CrossWorlds
Wisp items and random pickups generate high per-race variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 64
Shortcut and line knowledge is fully mapped
Sonic Racing CrossWorlds
Team ability combos and track shortcuts are learnable solvable systems
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.