Such a hard choice....
It would be between Alpha and Iota. I love the demeanor of Alpha men and the organization's history and principles.
But I think I would lean more heavily towards
Iota Phi Theta. Iota is definitely different, and I'm one of those people that just likes to be different and unique. (Well, duh, I'm a Sigma in the Southeast. lol) Also, their 39 year history is interesting and compelling, and I love the motto: "Building a tradition, not resting upon one".
OK, why do I feel like I'm writing a "letter of intent"?