looks

The initial impression we all have is that A Phi, Zeta and Phi Mu are the "pretty girl" houses, even though every house has tons of beautiful girls. But I don't think you can really generalize like that because I know plenty of girls in each of those houses that are average looking but otherwise match and fit well with those houses and they get bids. There are girls that are not rail thin, have weight issues, are not stunning, etc. in each of those houses. So the short answer to me is: there are no such houses.

That said, I think there are houses (and those are the three) where looks is important to them and they appear to pledge a lot of pretty girls. For ZTA and APhi, I think you can even say they might be more willing than some others to overlook past indiscretions or weak academics--if you look particularly fetching (i.e., their frat friends will be excited to see you... ).