Single reusable value for post meta: Custom Taxonomy or Post Meta?

For mutually exclusive values use post meta. It is faster to read than assigned taxonomies too.

It is possible to create your own interface:

  1. Set the parameter show_ui to false when you register the taxonomy.
  2. Register a meta box where you print out all existing taxons with radio boxes.
  3. Add a save action to assign the value to the taxonomy.

But in most cases you’re doing something wrong and misuse the taxonomy. 😉

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