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 · Practiced Mastery
The 3DS Mario Kart that added gliders, underwater driving, and kart customisation.

Execution · Practiced Mastery
DOS-era kart racer with animal drivers flinging hedgehogs at each other.
Mario Kart 7 leans Execution (Practiced Mastery); Wacky Wheels leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Drift boosts, gliding, and underwater control
Wacky Wheels
Cornering lines and hedgehog shots demand steady inputs.
Mario Kart 7 leans a little harder on reads, though the gap is small.
Mario Kart 7
Online lobbies reward anticipating rivals' items
Wacky Wheels
Split-screen rivals add light human prediction.
Mario Kart 7 leans a little harder on variance, though the gap is small.
Mario Kart 7
Item luck shapes every race
Wacky Wheels
Item pickups and AI rubber-banding inject randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Kart customisation and track-specific routes
Wacky Wheels
Track memorization and shortcut routing converge fast.
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.