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

Execution · Twitch Chaos
Kart racing with random item pickups and drift timing on themed tracks.

Execution · Practiced Mastery
Arcade driving gated by a randomised upgrade-card progression economy.
Madagascar Kartz leans Execution (Twitch Chaos); Need for Speed: Payback 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.
Madagascar Kartz
Steering, drifting and item timing matter in races
Need for Speed: Payback
Arcade handling and chase setpieces need decent hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Madagascar Kartz
Rubber-band AI is scripted, not adaptive prediction
Need for Speed: Payback
Cops and rivals run scripted pursuit logic
Madagascar Kartz leans a little harder on variance, though the gap is small.
Madagascar Kartz
Random item pickups swing race outcomes
Need for Speed: Payback
Speed-card upgrade rolls gate progression randomly
Need for Speed: Payback leans a little harder on optimization, though the gap is small.
Madagascar Kartz
Track shortcuts and item management reward knowledge
Need for Speed: Payback
Grinding efficient builds and routes is the systems layer
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.