head to head
The Binding of Isaac: Afterbirth+ asks more than Mario Kart 8, and the gap is optimization.

Execution · Twitch Chaos
A kart racer where controlled chaos from random items tempers otherwise precise driving skill.

Execution · Twitch Chaos
Dodging under fire while leveraging deep item knowledge against run RNG.
Mario Kart 8 leans Execution (Twitch Chaos); The Binding of Isaac: Afterbirth+ leans Execution (Twitch Chaos).
The Binding of Isaac: Afterbirth+ leans a little harder on execution, though the gap is small.
Mario Kart 8
precise drifting and item timing matter
The Binding of Isaac: Afterbirth+
Dodging bullet patterns while aiming tears is constant
Mario Kart 8 leans a little harder on reads, though the gap is small.
Mario Kart 8
minimal, mostly reacting not predicting
The Binding of Isaac: Afterbirth+
Enemies are random or scripted, never adaptive
The Binding of Isaac: Afterbirth+ leans a little harder on variance, though the gap is small.
Mario Kart 8
item boxes are heavily randomized
The Binding of Isaac: Afterbirth+
Item pools, room layouts and pickups define each run
The Binding of Isaac: Afterbirth+ leans clearly harder on optimization.
Mario Kart 8
track lines and item strategy solvable
The Binding of Isaac: Afterbirth+
Encyclopedic item synergy knowledge converts variance into wins
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.