cast iron is still the preferred material for a Dutch oven. EF homedeco's good quality cast iron can be passed down through generations because the material is so long lasting. 

A cast iron pot distributes the heat evenly and less heat is needed to cook the food. It will also retain heat longer, often a pan can be removed from the heat before the food is done cooking and the heat retained in the pan will finish the cooking process. 

Since the cast iron will retain heat, there is less fuel needed for cooking. The heavy lid seals the pot and steams the food, which keeps it moist and tender.