It's hard to say which fraternity I like the best, because there are so many aspects to any organization.
That said, I had a great many friends in college who were SAEs and I have lots of wonderful memories of a great bunch of guys.
I feel that Delta Tau Delta is most impressive because of their "Complete Delt" program. DTD seems to be really innovative when it comes to easing the transition from high to college, encouraging the brothers to lead by example on campus and trying to prepare them for life after college. Bravo!