The normal camping tent demands more time to set up and is not the ideal way to wrap and pack often, when you want to move to different places in a regular manner. It's a great solution if you plan to remain for several days in 1 location where conditions (earth, climate, temperament ) are easy moving.
A hard top roof top tent is deployed and retracted in moments and is perfect when you're able to move with a big vehicle on complex terrains (shores not excluded). You're higher from the floor with all the positive things this implies (as mentioned). You can move faster and easier.
Having a Car Roof Tent Hard Top you have all the colour -literally- next to your automobile. Such a tent is perfect where a camping tent is not needed. As an example when you intend to leave and return in the same day but you do need privacy and shade to enjoy your lunch and comfort. On single day trips, such a Car Roof Tent comes handy once you travel with children and you want to have that color on a beach or another place.