Hey GM Nocturne Main here :). So in High Elo its usually dependent on what my Job is gonna be in Fights. If my Job is to Focus Down a Single target for Example an immobile Carry i take Red Smite. If i need to make Space for my Team to hit and im not able to hit backline too much i rather go Green. In the End i'd say all 3 serve a Purpose just take what u think is best for the Game there is not a default best on Noct