head to head
Need for Speed: Rivals asks more than Runbow, and the gap is optimization.

Execution · Pure Mechanics
Open-world racer where banking risky speedpoints against human cops drives the tension.

Execution · Pure Mechanics
Reaction-speed platform racing where shifting colours keep redrawing the level under you.
Need for Speed: Rivals leans Execution (Pure Mechanics); Runbow leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: Rivals
Open-road control with pursuit tech timing
Runbow
Fast platform racing through vanishing platforms is pure reaction
Runbow leans a little harder on reads, though the gap is small.
Need for Speed: Rivals
AllDrive mixes human cops and racers in
Runbow
Light jostling with human racers, but little deep prediction
Runbow leans a little harder on variance, though the gap is small.
Need for Speed: Rivals
Dynamic open-world encounters and weather
Runbow
Colour swaps and party chaos randomise each race
Need for Speed: Rivals leans clearly harder on optimization.
Need for Speed: Rivals
Risk-versus-bank speedpoint economy
Runbow
Minimal systems - momentum tricks and level memory only
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.