Custom taxonomies vs post meta data

There are many articles about the difference between custom taxonomies and post meta data. Here are some differences I experienced:

  • There is no index on the post meta value.
  • With the builtin WP_Query functionality, you cannot search with operators like <, >, =, >=, BETWEEN, etc. in custom taxonomies, so if your values are numbers, for example years, and you want to search for every post earlier than some year, you have to use post meta data.
  • No ordering of custom taxonomy in the admin.
  • Post meta data is linked to 1 post, custom taxonomies are shared between multiple posts, because the term_id is linked to the post and not the key and value.
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