which docx format to recommend to MSO Word users?

users
#1

Have been trying to determine what to suggest as preferred/ default file
save format for users stuck in MSO Word, wrt feature support and LO
cross compatibility:

.docx actually has two save file type options for the one extension in
MSO Word:
- Word Document
- Strict Open XML Document

I have been searching, reading Wikipedia on the format,
https://en.wikipedia.org/wiki/OpenXML
and as yet have not been able to find definite answers:

a) which is best for LO compatibility ?

b) are there any more/less features in one format or the other:
   - in LO ?
   - in Word ?

The strict format is an ISO standard and is younger, and may have some
issues on that basis:
https://bugs.documentfoundation.org/show_bug.cgi?id=83571

But perhaps it is better anyway?

Thanks for any insight and links you can share,
Zenaan

#2

I always recommend older pre-OOXML formats (2003 Office formats, .doc, .xls, etc....) because even Microsoft can't keep up with OOXML.