as sakob said , it depends a lot on how much u cr-ed Imelia , since she actually tanks , compared to lyla. That being said , lyla is 1of the highest dps duelist in the game , so shes also worth leveling. She will simply outkill what she can't tank. So , if your imelia is at least at cr2 , i'd prob go for it , if not , lyla.

Wouldn't bother with bronze bandits.