Convection ovens are better than conventional ovens because they circulate heated air with a fan, resulting in faster and more even cooking. This also allows for a lower cooking temperature and reduced cooking time, which saves energy and retains more nutrients. Convection ovens are also more versatile as they can be used for baking, roasting, and even grilling. However, conventional ovens still have their place in the kitchen for tasks such as slow-cooking, broiling, and toasting. Ultimately, the choice between the two depends on personal preference and cooking needs.