Advice on who to pull (Augusta/Iuno/Mornye)

Hello everyone!

I currently have a team of Phrolova/Cantarella/Lynae with Shorekeeper in the background. I started the game relatively recently so I haven't played all too much. I am currently deciding on the upcoming banner.

It should be noted that I did pre-farm a set for both Augusta/Iuno, but seeing the recent info on Mornye is making me kind of think she might be a good option as well. I have 31k astrite to spend currently so I was thinking of either Augusta/Iuno or Augusta/Mornye

I did hear that Aemeath is going to be the next best thing since sliced bread though, which is also giving me pause. Any advice? My main focus right now is trying to get a 2nd team going, but I don't want to waste all that astrite.