Pros: You will usually receive TOC alerts from publishers before you receive alerts from EBSCO or JournalTOCs. In addition, the Alaska State Library subscribes to some online journals for all State employees, such as Nature and Marine Pollution Bulletin; for those journals, the publisher TOCs are a more direct route to full text articles.
Cons: You have access to many full text journals and magazines in the EBSCO databases, but publisher TOCs will not take you to EBSCO full text articles. Plus, each separate publisher will require you to set up a free account to obtain their TOCs. If you want a lot of TOCs, that may mean a lot of separate accounts.