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 kart racer testing drift handling and item use across American courses.
Mario Kart 64 leans Execution (Twitch Chaos); Mickey's Speedway USA 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
Mickey's Speedway USA
Kart handling and drift timing 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
Mickey's Speedway USA
AI racers are scripted, no adaptation
Mario Kart 64 leans a little harder on variance, though the gap is small.
Mario Kart 64
Item draws swing every race
Mickey's Speedway USA
Weapon item pickups add randomness
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
Mickey's Speedway USA
Track knowledge and item usage reward learning
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.