Yes, they were interesting, too. I thin it was the density of the plot and characters as well as the setting that made the Frank Herbert books the best of the series. Herber&Anderson just didn’t have the flare for mixing all the element as well as Frank. Although, they did keep the sectioning of the themes at the same level as Frank did.
Humm …. It has been long enough since I read them—are the Honored Matres Frank’s or Herbert&Anderson’s. Having a tough time remembering, I should probably look at the books, themselves.

Rothbardian_fanatic

I really liked the later Frank Herbert books as well. The ones with the Honored Matres.

Undisciplined

BooksAndArticles

Chronological Order of Dune Books – Dune Novels (2020)

If you go to the website, you can see which ones were done by who. Frank Herbert wrote more, that, in my opinion, are far better than the Herber&Anderson books. However, Herber&Anderson wrote their books from notes and outliines they found from Frank Herbert’s safe deposit box. Overall the whole series, at least the ones I have read, is excellent and interesting reading.