old row vs new row

I am so confused. I dont go to bama.
what are the top houses at Alabama.
just because you are old row doesn't mean you are top.
for instance like zeta is getting all these pretty popular girls so are they top.
like is zeta higher than chi o how does this work.
is it like zeta and phi mu aren't even considered competitors I dont understand. but like phi mu and axo are?