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

Execution · Twitch Chaos
A fast twin-stick roguelite where chaotic item variance and precision shooting share the top bill.
Mario Kart 8 leans Execution (Twitch Chaos); Neon Abyss leans Execution (Twitch Chaos).
Neon Abyss leans a little harder on execution, though the gap is small.
Mario Kart 8
precise drifting and item timing matter
Neon Abyss
Fast twin-stick shooting against dense waves demands real input precision
Mario Kart 8 leans a little harder on reads, though the gap is small.
Mario Kart 8
minimal, mostly reacting not predicting
Neon Abyss
Enemies are scripted; no adaptive behaviour exists
Neon Abyss leans a little harder on variance, though the gap is small.
Mario Kart 8
item boxes are heavily randomized
Neon Abyss
Item pool is enormous and chaotic; runs diverge unpredictably
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 8
track lines and item strategy solvable
Neon Abyss
Synergy stacking with passive items rewards pattern recognition
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.