Does anyone know the main differences as to what makes each Grand Company different from one another? Why would I choose Grid, Uld, or Lim?

I currently have an archer main so I have chosen Grid as my Grand Company as it is my main city and assumed that my archer will benefit from the Twin Adder as far as gear goes.

Did the Devs release a detailed compilation of the Differences or do we have to figure out for ourselves our wait until 1.19 is released?