By National Library of Medicine, USA.
MEDLINE includes authoritative medical information within medicine, nursing, nutrition, physiotherapy, occupational therapy, biomedicine, healthcare systems, preclinical sciences and much more.
MEDLINE uses MeSH indexing to retrieve articles in more than 5,400 biomedical journals. MEDLINE can also be searched through PubMed.
The difference between searching MEDLINE through PubMed or MEDLINE through EBSCO is whether your search words are automatically transformed into MeSH terms. This is the case in PubMed but not in MEDLINE through EBSCO. Moreover, searching MEDLINE through Pubmed automatically explodes MeSH terms; this is not the case when searching MEDLINE through EBSCO where you have to choose the underlying concepts yourself.
There are more searchable references in PubMed compared with MEDLINE. It is e.g. possible to search ahead of print, Pre-MEDLINE, author, manuscripts and books: https://www.nlm.nih.gov/pubs/factsheets/dif_med_pub.html (link is external)
A comparison has been made of Ovid MEDLINE and PubMed at Dartmouth biomedical libraries: http://www.dartmouth.edu/~library/biomed/guides/which_medline_chart.html (link is external).
There is no difference between MEDLINE through Ovid or MEDLINE through EBSCO.