The Sci-Fi Channel Miniseries, remains the most faithful adaption of Frank Herbert's novel. Don't let anyone tell you otherwise!
Denis Villeneuve's Dune, has proved itself in full context, that as an adaption it must be judged to be a failure, despite the Avatar (James Cameron) level praise it is getting for the "Cinematic Experience". And not merely a failure. But a deliberate corruption of the text to fit the directors personal preferences rather than the books as they exist and an odd fixation on discourse rather then the source material. Which is not at all far from Jodorowsky's Dune. At least Alejandro Jodorowsky was upfront about what he intended.
Denis Villeneuve is worse because he's more subtle about his alterations and his agenda. If you lack a point of reference you can easily be fooled into thinking he's been faithful and actually hasn't made any changes whatsoever. Denis Villeneuve also uses David Lynch;s movie as a visual crutch and just softens its visuals -- Sometimes in absurd ways. Again, at least David Lynch owned what he was doing. Denis Villeneuve hides behind being a "Prestige Director" and one who doesn't actually care for the genre he seems to meddle in. It wasn't too long ago that many particularly those who love the original called him out for the trainwreck that is Blade Runner 2049 but all that got swept under the rug and oddly forgotten when it came to DUNE. Even Gary Buechler (Nerdrotic) who hated Blade Runner 2049 seems to have gotten swept up into the "Cinematic Experience" and forgotten how he would routinely poke fun at Denis Villeneuve.
But I can assure you back in the 2000 during the hype of the miniseries there was no effort to reframe Paul Atreides as the secret villain of his own story nor was he being setup to be some object lesson for viewers and certainly unlike Denis Villeneuve who is openly hostile towards the character while enamored of the Bene Gesserit and outright invented a Chani that does not exist -- John Harrison respected the book.
I can promise you, when the dust settles, all anyone is going to care about or fondly remember about these movies - At least as fans of the original work, are the ornithopters.
John Harrison, turns out to be, Dune Fandom's Peter Jackson. Even having made similar statements regarding keeping fidelity towards the original work.
If you feel the impulse to watch DUNE on screen, take a couple hours and spend it on the miniseries. I have done so, at least three times recently and came away with a sense of completeness.
More to the point -- The characters remain who they are in the book and not a reimagining or agenda driven repurposing. The Chani of the Miniseries is the Chani of the novels.
