What is better subdomain or subdirectory?

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Tags

1. #structure
2. #similar
3. #content
4. #setting
5. #differently
6. #other
7. #easier
8. #allows
9. #understand
10. #folder
11. #categories
12. #website
13. #subfolder
14. #subfolders
15. #servers
16. #create
17. #subdomain