ranks for guys and girls

I know it's not the usual tier system but this is how I see it and I think it makes the most sense.

Sororities:
Tri-Delt and Chi O
Kappa, Zeta, and DG
-Slight gap-

Pi Phi and Theta
-Slight gap-

Alpha Chi

-Big gap-

KD and DZ
Gamma Phi

-Big gap-

ADPI

Honestly, Kappa, Zeta, and DG are all prettier, more popular/social, and better liked by guys than Tri Delt or Chi O. I personally think their nicer and more down to earth too. But by almost every measurable mean (academics, retention, philanthropy, etc.), Tri Delt and Chi O are ahead.
I think the gap between the top 5 and Pi Phi/Theta is a lot smaller than people try and make it seem, and that both those sororities have the ability to one day be top tier. AXO also gets severely undersold for how good of a sorority as they are.
The bottom four is the bottom four, but they get put down more than they deserve, and DZ isn't nearly as bad as people make it seem, it's just a few girls.

Fraternities:
KA Fiji SAE and Sig Ep
-Slight gap-

Delt and Sigma Chi

-Big gap-

Pike and Kappa Sig
-Slight gap-

Beta and Sigma Nu

-Big gap-

All the other frats

KA Fiji SAE and Sig Ep are all basically even unless you want to nit pick. They all excel in their own ways and none of them excel at everything.
The gap between the top 4 and Delt/Sigma Chi is smaller than people like to make it seem. Delt and Sigma Chi aren't quite on the same level as the top 4, but if any other frat would rise to top tier in the future, it'd be one of these two.