One was the Dune book and one was a combination of Dune Messiah and Children of Dune. It was, for these two, one continuous story.

Rothbardian_fanatic

I like series that prove you don't need a massive budget to be good! I'll admit to preferring the new movies even with all the changes, but the miniseries are still very close.

I think the 2 miniseries were the best. 
They were very accurate. 
It was lower budget, but enjoyable. 

Satosora

They're definitely worth checking out if you're a fan of the books, they're fairly faithful to them on a lot of things. They're both three episodes.