Ruan Mei or Fugue as an f2p player?

This is my current Boothill and Firefly build. As of today, I have 27 wishes and I'm at 0 pity, not guaranteed. I still want to test my luck though. The current characters with good synergy for Boothill that I have are:

• E4 Gallagher with S5 What Is Real? lc • E1 Bronya with her signature lc • E6 HTB with S4 Memories of the Past lc (Lmk if I forgot anybody)

Some other information about my character roster: • I don't have Lingsha and I don't plan to pull for her • I have all existing 4-stars in the game • I have Firefly and I use her • I'm still building Firefly (mainly farming for better relics) and I do consider getting her lc if I have enough wishes or on her next next rerun • I use both FF and Boothill in MoC in separate teams, but the issue is my lack of break focused characters for both teams • I would also like to ask if pulling for Sunday is a better option too, since I saw showcases with Boothill + Fugue + Sunday.

If you have any advice on character builds and team comps please tell me. I am open to questions as well! : )