4 q's

1. Expect that yes, some will.
2.The top tiers all care the most about looks. They are top because their girls are the prettiest and that's the only reason why. The rest of the sororities will care in varying degrees, but it's not as obvious or primary. What's most important to all sororities is looking your best. Looking your best isn't the same as being the hottest girl on campus, it means did you present yourself in the best light and put a sincere effort into a good presentation of yourself; do you look like you tried and care about taking care of yourself?. Consider all of recruitment to be like a first date and, just like all the sorority girls dress up and make themselves and their house look their best to impress you so you'll pick them, so should you.
3. Research each sorority's website, twitter, instagram etc. You'll learn a lot about them through that and see what they're involved in, what types of activities they highlight throughout the year, do they only show off their size 2 blonde sisters, and what philanthropies they're involved in. Most sorority girls don't spend enough time with other sororities to tell you what's special about them, so it'd be impossible to capture that TRUTHFULLY on this site.
4. The sororities that dint have houses historically recruit out of fraternity houses.

^^^^^^^^^^^^^Well thats awkward..