Save for Fugue or Ruan Mei?

Hi Boothill mains!

So Ruan Mei dodged me during her rerun as I started in 2.2 while I couldn’t get Fugue after using my tickets on Jing Yuan + Sunday.

Currently I’m trying to focus on my Boothill team.

Boothill - S4 Shadowed by Night - 151 SPD

Bronya E1 - S1 Bronya Sig - 150 SPD

Harmony Caelus

Gallagher

I’ve been wanting to replace Caelus with Ruan Mei or Fugue but I’m not exactly sure who. Assume I’ll get E0S0 Ruan Mei/ hopefully E1S0 Fugue

I also have to take account of my PF teams. The first is Jing Yuan + Sunday + Robin while the second is the Himeko Herta combo with either Ruan Mei/Fugue, so I don’t know who is better.

I’ll appreciate your help!!