Which Colorless Units will 5* promote? Leon or Clarine

Leon (+atk/-res) - I can give him close counter build on him. I have Klein and Brave Lyn but more archers the better right especially going for brave bow user?

Clarine(+spd/-res) - I can build her up with the Optimal Build based on her FE Gamepress Page. I dont have a good 5* healer yet so this is a good opportunity.