Atk% or Ether dmg% with Caesar?

For those who run Zhu Yuan with M0W1 Caesar and M6W5 Nicole, what have you seen that worked better for ZY in general because of Caesar 1000 atk and Nicole dmg bonus? When I went and tried in the practice mode the dmg for the ether bonus was higher, but when I was experimenting with the dead end butcher, atk% came out on top. What's better in general with the ether build I have? (With atk% my crit ratio is the same, atk is 3800)

For those who run Zhu Yuan with M0W1 Caesar and M6W5 Nicole, what have you seen that worked better for ZY in general because of Caesar 1000 atk and Nicole dmg bonus? When I went and tried in the practice mode the dmg for the ether bonus was higher, but when I was experimenting with the dead end butcher, atk% came out on top. What's better in general with the ether build I have? (With atk% my crit ratio is the same, atk is 3800)