動向 focuses on the current movement or direction of a specific group or situation, while 趨勢 implies a broader, longer-term trend.
Etymology
From Chinese 趨勢 (qūshì), meaning 'trend' or 'tendency'. The kanji 趨 means 'to run' or 'to hasten', and 勢 means 'power' or 'momentum', together suggesting the direction in which things are moving.
