There is also a difference (at least, among the Greeks) in mindset. Generally, parishes in the eastern U.S. are more "ethnic" than parishes in the western U.S.
When I decided to turn East, I had two choices: a small Antiochian parish, and a large Greek one, buth in the same city. I tried the large Greek one and never looked back. It's cosmopolitan, more than half the membership is non-Greek (a smattering of MIddle Eastern and East European families, and a plethora of converts), and, with the exception of a few stock liturgical phrases in Greek and other languages of Orthodox countries, worship is entirely in English. I was always welcome there, and they reacily recognized my singing skills; I served as a cantor till my hearing and sense of tonality failed me.