sorority differences

Hi, I'm going to be rushing in a few weeks and I was wondering about some of the differences between the sororities. I don't mean in their looks or stuff like that because that is subjective and I've already scrolled through their pictures on Facebook. I just want to know which ones party more, which ones have a stronger emphasis on sisterhood, which ones do more philanthropy projects, which ones require a larger time commitment, which ones are more relaxed, which ones have more socials (not better socials, MORE socials). I know that the rush parties don't last for very long so I want to know as much as I can beforehand.