SEO: Which is better Subdomain? Subdirectory?

If you want to get the most from your search engine optimization, which should you use . . . Subdomains? or Subdirectories?

We’ve discussed subdomains (Sept.30) – and subdirectory is just another name for a ‘folder’ located within the main root directory of the domain. Subdirectories, i.e., folders are used to make a website’s content more organized […]