The 2015 dub is technically superior (better audio quality) but artistically inferior to the raw German original.
: The English dub is a popular choice for families and younger children who may find reading subtitles challenging. It allows the audience to focus entirely on the film’s breathtaking visuals, which were shot on location in the Canton of Graubünden. Heidi 2015 English Dub
Because the film uses real human actors (not cartoons), the lip-sync in the English dub is not perfect. This is the only minor drawback. The actors’ mouths move to German syllables, not English ones. However, children rarely notice this; they focus on the gorgeous scenery and emotional story. The 2015 dub is technically superior (better audio
If you'd like to explore more about this film, I can help with: not English ones. However