We had a really good thread about this in the past, but I have no idea what it was called.
Several of us also posted "recruitment threads" about out experiences. Search for "Brian Pumper" to find mine.
I chose Alpha Phi Alpha for three reasons:
1) The history of the fraternity deeply resonated with me like no other fraternity did.
2) The national programs were a reflection of my own values.
3) When I was in a room full of Alphas, I felt like I was at home.
My love for Alpha snuck up on me my senior year in college -- although looking back, an Alpha was all I could have been.