I love this topic!
If none of the girls that were in my chapter when I joined, had never joined another chapter; Chi Omega! I loved them in rush.
If the girls that were in my chapter when I joined, had joined other chapters; probably Theta.

Their our biggest competition during rush, so naturally I'd feel more comfortable w/ their members.
If we had an ADPi chapter though, they would have been my top choice. Every ADPi I've ever encountered has made me wish that either I was one too, or that she had joined my sorority! And since they have the same flower I wouldn't have a lot of redecorating to do.