Best Weapon

Currently I'm running R5 finale on my C6 qiqi. I only have one R5 finale and 1 extra billet. I'm told finale is BiS for Odette. Would it be better for my to have R5 Finale on QiQi and r5 emberwell on Odette or vice versa?

I plan to mainly play Odette in Stellar swirl and Qiqi in Stellar conduct but there will be some mix match and sometime when. I play them on the same team. I'm usually prioritizing clearing fearless stygian