We have used several car rental companies on the island and our favorite for the past three years is Sunset Car Rental. They pick us up at the airport, take us back to their location which is right across from the airport, we sign the papers and we're on our way. When it's time to leave, we go to their place and they drive with us to the airport, unload our luggage and we're done. The nicest guys too. Great customer service. Will always go back to them.
Their website gets a certificate error when you go to it, but it's okay to go there anyway, they haven't updated it apparently. https://sunsetaruba.com/