Don't pick a school for a particular sorority. If Greek Life is an important aspect in a college that you choose, I think you should be able to find your niche in a sorority at any university. For example, UW-Madison has greek life and so does Marquette. They are two very different schools, and if you went through recruitment at either, you could probably find your niche. But you shouldn't look at the college application process by thinking "I want to be an XYZ at UW-Madison". Pick the school based on the school, then think about sorority recruitment.
And also, don't ask for info about each sorority. No one is going to come out and say "XYZ is the best" or "ABC is the fat ugly nerdy sorority". If you want to do your own research about greek life at Wisconsin, here's the link:
http://www.uwgreek.com/sorority/home.html
Where are you applying? I am glad to see that you are interested in greek life, and good luck with the college application process!