I would bet that Sint, Nothoi, and OG are all very quiet, as none of them are involved in anything right now. Melhed is involved in a big war, so might be most exciting.
That you are aware of
Yes things are relatively quiet in Sint, Nothoi and OG at the moment. I cant speak for Sint or Nothoi, but things are happening in OG and there will be involvement in what is happening on BT.