from my understanding, H3 doesn't guarantee that a child cell falls strictly inside the geographical region of its parent (since is a hexagon cannot be perfectly comprised of smaller hexagons).
While the hexagon has less distortion - we loose some of the nice child <> parent guarantees that S2 offers in my experience.
While the hexagon has less distortion - we loose some of the nice child <> parent guarantees that S2 offers in my experience.