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
Tests kart-racing line execution across three vehicle types with item luck on top.

Execution · Pure Mechanics
Open-world racer where banking risky speedpoints against human cops drives the tension.
Diddy Kong Racing DS leans Execution (Practiced Mastery); Need for Speed: Rivals leans Execution (Pure Mechanics).
Need for Speed: Rivals leans a little harder on execution, though the gap is small.
Diddy Kong Racing DS
Drift boosting across car, hover and plane handling
Need for Speed: Rivals
Open-road control with pursuit tech timing
Need for Speed: Rivals leans a little harder on reads, though the gap is small.
Diddy Kong Racing DS
AI rivals are scripted; multiplayer prediction stays shallow
Need for Speed: Rivals
AllDrive mixes human cops and racers in
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing DS
Balloon item pickups swing race positions
Need for Speed: Rivals
Dynamic open-world encounters and weather
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diddy Kong Racing DS
Zipper routes and vehicle choice per track are learnable
Need for Speed: Rivals
Risk-versus-bank speedpoint economy
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.