Sorority - Alpha Phi
When you are popular you do things first then the rest follow your lead. In 1886 Alpha Phi became the first women's fraternity in America to build and occupy its own chapter house. In 1902 Alpha Phi called the inter-sorority meeting that resulted in the formation of the association now known as the National Panhellenic Conference. In 1995 Alpha Phi was the first NPC member to have its own official website.
Sigma Chi has always had and will always have a stacked roster. Dudes such as John Wayne, Brad Pitt, David Letterman, Tom Selleck, and Woody Harrelson are all Sigma Chis.