Best fifth member for these teams.

Hi.

I just unlocked 5 member party for my 2 favored teams, i am not sure wich role will fill better. Finishing Elheim zone, starting Bastoria.

First squad is alain, scarlet, witch, berenice. I love this squad, now i am using aubin, yo use viking that i do not use in any other team, but feels... Weak. I am thinking replace him for Celeste or maybe melissandre. Not sure if liza or some archer type unit will fill better, i am dealing fine with archer with witch adding true strike.

Other team is Berengaria, druid, doom knight, Chloe. I have added Auch, he does lot of damage and burn that sinergizes with ren and doom knight (i think), but he is extremely slow, even increasing initiative with items... When he starts to throw her fire, battle have ended.

Thanks in advance! I love the team building in this game.