I'm a Zeta legacy and on top of that my mom went to the same school and was president of Zeta so this is a somewhat hard question to answer because all I have ever known is Zeta. Going through rush I could sing along with the sisters because my mom sang a lot of the songs to me as a child.
BUT, if I did not chose a school with a Zeta chapter (by the way, all the schools I applied to had a ZTA chapter - I didn't apply to any schools if they didn't), I would have been a Tri-Delta. I love the girls that were there when I was there - now they're TOTALLY different.