valid rankings?

Rankings don't matter. Every frat/sorority is made up of amazing people. What matters is where you feel you fit in best! Go through rush/recruitment with an open mind and just have fun getting to know more people in the USD community!

Though the rankings are never definitive, you should expect different things when you join sororities.
For aphi and kappa, expect to go out quite a bit and be around outgoing girls. Kappa girls are known to be more chill (and maybe more sloppy) whole aphis are more image obsessed. Gphi and AXO have low key and sweet girls who don't need to party to have fun.
Theta is super involved and has the best GPA. Gotta keep up.
KD and ADPi are still forming and changing, but KD has a better rep.