head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
The handheld Mario Kart blending SNES-style handling with item-fueled races.

Execution · Pure Mechanics
An action racer where players detonate the environment itself to wreck rivals and reroute the track.
Mario Kart: Super Circuit leans Execution (Practiced Mastery); Split/Second leans Execution (Pure Mechanics).
Split/Second leans a little harder on execution, though the gap is small.
Mario Kart: Super Circuit
Snappy GBA handling rewards precise drift control
Split/Second
Drafting, drifting and dodging collapsing set pieces.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart: Super Circuit
Mostly AI races, light link-cable PvP
Split/Second
Timing powerplays against human rivals rewards prediction.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart: Super Circuit
Item boxes randomise every race
Split/Second
Triggered explosions and route changes upend races constantly.
Mario Kart: Super Circuit leans a little harder on optimization, though the gap is small.
Mario Kart: Super Circuit
Time-trial lines and shortcut routes
Split/Second
Knowing every trap and shortcut converges with play.
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.