Roof Racks for Luggage

Hi All

Looking to plan a trip and our car won’t fit what we need to take. I’ve seen roof pods and roof luggage racks. What do people recommend and why?

I’ve got a Kia Sportage 2018 model. Is it just as simple strapping your suitcase to the roof in a luggage tray?

Sorry this is all foreign to me so looking for guidance!