re: What is the best movie that has also done its source book the most justice?

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LOTR

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Again, NO

Fellowship was close, but they left the entire Bombadil/Barrow Downs story out, which completely changes the importance of Merry's blade against the Witch King later.
Also, Strider had the shards of Narsil the whole time in Bree, he didn't have a functional sword.

Two Towers, you have Faramir bringing Frodo to Osgilliath, which was a major no-no on multiple parts. Not only do they never go there, the whole issue with the Ring is if you start to want it, you can't let it go. Faramir (book) said "not if I saw it on the roadside, would I pick it up". He understood. Faramir (movie) said "here's a nice prize, to prove my worth", which should have doomed him.
Also they flip Gandalf and Theoden, book Theoden wants to fight on the plains but listens to Gandalf (go to Helms Deep). In the movie, Gandalf tells him to fight on the plains, but Theoden says no, we will go to Helm's Deep. After Gandalf frees him from Saruman's enchantment, in the book he's all in on Gandalf being the leader, and would do anything he says. The film undercuts that.
They also exile Eomer from Edoras in the movie so he can return to save the day; he's at Theoden's side the whole time in the book.

ROTK, there's that whole mess with the Dead coming to Minas Tirith, which never happened in the book. And the book ends with the Scouring of the Shire, where Saruman has seized power and ultimately is killed by Wormtongue. They skip that completely, and kill Saruman off way too early.

The movies are great on their own, but they are significantly different from the books, and sometimes lessen the importance of what the books say.