thoughts on fraternities?

I'm going through IFC rush in the fall but I've hung out with some of the fraternities over the course of the summer. the fraternities I've hung out with are; KA, Pi Kapp, Theta Xi, Pike, and Fiji. Overall, Theta XI, Fiji and Pike seemed the most relaxed, while I feel KA and Pi Kapp were very uptight ish. Girls I met when I when going out told me nothing but good things about theta xi. However, KA and Pi Kapp was not one of their favorites in their mind. Fiji and Pike seemed neutral, not really everyones favorite, but nothing really too negative. What are the general reputations of these houses? I'm trying to keep an open mind. Thanks!