Numerous Content Types or Taxonomy Terms?

I have many subjects on my intranet, and each subject will have many nodes, e.g., HR, IT, Newsletters, Calendars, etc.

Would it be best to have many Content Types or fewer content types and add a field that has a drop-down list of categories from a taxonomy list?

Thank you!

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Source: https://www.drupal.org/taxonomy/term/22/feed