What type of roofing is best?
Residential, most houses are good with a 30-year architectural shingle roofing type. That is the most affordable bang for your buck quality roof you are going to get.
As for the commercial, it depends because a hotel compared to a restaurant or a warehouse to a restaurant are two extremely different types of roofs. Top kitchen and oven and heating membrane dissolve. You need a roof that won’t dissolve. Animal grease and animal fat will eat the membrane of the insulation.