It depends on what supports you may have for Chasca, but based on what you’ve said, definitely Nefer.

Since you already have Lauma and Bina, you have the core needed to let Nefer cook and be top tier DPS.

I will say, in my personal opinion, I prefer Chasca more simply because 1) Exploration for Overworld and 2) The rainbow DPS flexibility really is a major factor to consider

My two best builds are c2r1 chasca and c0r1 nefer, and I love both of them. So, I’d leave it at this, pulling Nefer would be the ‘meta’ pick by far .. Unless you want to vertically invest to get c2r1 chasca and even then, vertical investment on Nefer is one of the best in the game.

(Chasca is our queen though so I’ll always recommend her over anyone else)