Which is official open xml sdk nuget repo: DocumentFormat.OpenXml or Open-XML-SDK?

Question

Googling Open XML SDK nuget gives two results in the first page:

1. DocumentFormat.OpenXml
2. Open-XML-SDK

Both seems quite actively updated, and even the descriptions are exactly the same! But it seems the former has significantly more downloads. Could anyone explain a little which one to choose, and why there are two repos?

Answer 1

This is from Microsoft, receives updates and currently has 153.2M downloads.

https://www.nuget.org/packages/DocumentFormat.OpenXml/

The other latest update was 2020, currently has 2.0M downloads.

Safe to say that code from Microsoft directly is better.