I don't know based on the rulebook. The provided context describes the movement priorities for Legions (page 54) and Hordes (page 55), specifying which types of hexes to prefer (e.g., Havens with the fewest Units, hexes with the fewest enemy Units and/or Threat, etc.). However, it does not specify who decides the path or if there is a default tiebreaker when multiple options are of equal priority.

To answer this question, the rulebook would need to explicitly state a procedure or authority for resolving such ties, such as a default player, the active player, or a random method. This information is not present in the provided context.

Source: Core Rulebook (pp. 21, 27, 54, 55, 60)