Princess Mononoke
I understand that 4.4 rating now.
What an incredible score, especially in an IMAX screen. The animation, as always with Ghibli, is top tier and timeless and used to its fullest to enhance the story. The story itself is great with good amount of depth and meaning behind it. A great cast of voices too (I saw the dub).
Might be the best of the Ghibli and Miyazaki I've seen so far, but Howl's Moving Castle is incredibly close that on any random day I might say they're tied.