LibreOffice is based on OpenOffice but OpenOffice is basically abandoned with every few updates or improvements over a good handful of years now. LibreOffice is generally seen as the successor and I wouldn’t be surprised is OpenOffice just gets archived.

I think you have it backwards. LibreOffice is the better one. OpenOffice has not seen any real updates since 2015. ( The apache foundation that is technicality still maintaining openoffice themselves say that OpenOffice has too many open security issues)

I think openoffice might be better for compatibility with Microsoft format docx.