Ping first. I live in the northwest US so NA-W was a natural choice.
After that I did a ton of research on the Kingdoms available, and they all offered a lot but the theme of Blackheart called to me the moment I saw it. Still, there were some Duchies and Counties in other lands that were very enticing. I finally came upon a particular Duchy/County combination within Blackheart and it all just clicked.
That's what sealed the deal and finalized my decision to choose NA-W.