I'd say choose which one you resonate with the most. Omega's cardinal principles are Manhood, Scholarship, Perseverance, and Uplift. I appreciate that they put manhood first and the story of how the founders came together and made it happen founding a society on an HBCU campus in 1911.
Aside from jokes it's all love for me as far as the other black greek orgs. I'm only concerned with Omega so don't keep up too hard with others are doing, but all in all, they all do good work in the community, have successful people repping them, are all about their brand of brotherhood and camaraderie, and all have their own brand of fukkery that makes them look bad.
So basically, you'll find all of the same kind of stuff among the different organizations. It's really more of a matter of personality, what you resonate with, and what you decide to put into it.