what are the real sorority rankings here?

Mercer is too small for a proper “tier system” but the rankings would probably be something like this:
1. Chi Omega
2. Phi Mu/Alpha Delta Pi
These vary slightly depending on the year and pledge class though. Honestly all three are great organizations imo. However, there are pros and cons of each one.
3. Alpha Gamma Delta
Idk enough about the NPHC sororities to rank them accurately, but they have a different rush process so they should probably be ranked separately anyways
Disclaimer: Rankings should not be the end all be all of your recruitment experience. Use this website to get an idea of what some people think of sororities, but don’t trust it completely. Go through recruitment and have your own experience. It’s not always about “tiers” but about where you feel most at home!