I notice that when downloading a footprint from Ultra-Librarian that it often includes a set of 3. When downloading the models for the ITS414N for example it includes three slightly different footprints: Sot223, Sot223-M, Sot223-L.
Are these footprints meant for different layers or are they alternatives based on the needs of the designer? If so, why should one footprint be chosen over the other?