I send PDFs, but always generated from docx files. I did the Open/Libre Office thing for about 15 years and if you do a lot of work in these you’ll find that MS Office is simply superior. You can still use a mostly compatible version of odt with it. There’s just too many handy things about MSO that I’ve learned it’s worth paying for. One example is opening PDFs with Word and having it do a surprisingly good job at converting it to a Word doc. Very handy stuff.