Which one is an efficient URL Structure?

Hello, I'm asking for your opinions about the following structures.

If we have an website with the subject CARS, and we have the following pages:

Best Cars, Best Cars under 15000$, Best Sport Cars, Best Sport Cars Under 15000$

Will you go with the following structures:

For Page "Best Cars": – domain.com/best-cars

For Page "Best Cars under 15000" – domain.com/best-cars/under-15000

For Page "Best Sport Cars" – domain.com/best-cars/sport

For Page "Best Sport Cars under 15000" -…

Which one is an efficient URL Structure?