What is the difference between oil painting on panels and canvas?

The technique I have developed over the many years I have been painting can be done either on a smooth canvas or MDF smooth panel. When I paint on canvas I typically purchase one that is of smooth portrait quality. Ampersand Smooth panels are my preferred surface choice, as they are ready to paint onto straight out of the packaging. My technique is best when painted on a smooth surface, so it is necessary to prepare canvas surfaces to be as smooth as possible for the same results that the smooth Ampersand Panels provide. My technique is the same when I paint on a larger or smaller panel, but I prefer the smaller panels because of the level of detail I can achieve.