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 mobile racing runner testing reflex lane-play under item RNG and upgrade grind.
Mario Kart 64 leans Execution (Twitch Chaos); Sonic Forces: Speed Battle 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 Forces: Speed Battle
Lane-switch timing and trap dodging decide races
Mario Kart 64 leans a little harder on reads, though the gap is small.
Mario Kart 64
Couch rivals bait shells and fakes
Sonic Forces: Speed Battle
Live opponents exist but interaction is mostly indirect items
Mario Kart 64 leans a little harder on variance, though the gap is small.
Mario Kart 64
Item draws swing every race
Sonic Forces: Speed Battle
Item rolls and character gacha swing outcomes
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 Forces: Speed Battle
Character upgrades and route knowledge compound over time
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.