Generally speaking, banana cakes are made with a lighter batter and are often decorated with icing or frosting. You can make them round or rectangular in shape, and they are typically served as dessert. Loaves, on the other hand, are made with a denser batter and often contain add-ins such as fruit or nuts. They are typically baked in a bread pan and are served not only for dessert, but also breakfast, brunch, and snacks.