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
A kart racer with an adventure structure and three vehicle types, lighter on item chaos than its rivals.

Execution · Practiced Mastery
The handheld Mario Kart blending SNES-style handling with item-fueled races.
Diddy Kong Racing leans Execution (Practiced Mastery); Mario Kart: Super Circuit 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.
Diddy Kong Racing
Drift boosts across car, hovercraft and plane demand precision.
Mario Kart: Super Circuit
Snappy GBA handling rewards precise drift control
Mario Kart: Super Circuit leans a little harder on reads, though the gap is small.
Diddy Kong Racing
Multiplayer item duels add mild prediction; AI is scripted.
Mario Kart: Super Circuit
Mostly AI races, light link-cable PvP
Mario Kart: Super Circuit leans a little harder on variance, though the gap is small.
Diddy Kong Racing
Balloon pickups and items inject moderate randomness.
Mario Kart: Super Circuit
Item boxes randomise every race
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing
Vehicle choice, balloon upgrade routes and boss strategies converge.
Mario Kart: Super Circuit
Time-trial lines and shortcut routes
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.