Rent a car or use public transportation?

Hello all,

I have time off in November, about 6 days. Thinking to visit North Africa. Still undecided between Morocco or Egypt.

If I visit Morocco I would be arriving in Casa Blanca. With the the plan to visit Fes, Meknes and surrounding area. Possibly changing direction and go to Marrakesh.

Is it better to rent a car or these destinations are reachable via public transportation from Casa Blanca?

Thanks