Do you use docx or odt when you save a word document? Why?

ODT and LibreOffice. Open Source, Freedom, Open Mindedness wherever possible.

I don't use word, I use LibreOffice, so I save as odt.

docx, because it will only be opened in word so there’s no point.

Ideally I’d write everything in markdown or LaTeX or Typst, but if I’m working with people who use Google Docs or Word, I use Google Docs or Word