Both of these organizations certify dance teachers yet it seems like they are two different camps. I am thinking about becoming a ballroom (international) style instructor so which camp is recommended? What's the global feel and trend out there? I am unfortunately in a city where I cannot train with anyone for either camp so I will have to rely on videos and short trips to neighboring larger cities.
IDTA or ISTD would be a more established certification, but unless you are trying to judge competitions your actual skills will soon come to mean more than the certificates.
None of the major societies would schedule an exam for a student who had learned from "videos and short trips", as they require endorsement from a preparation teacher before they will even schedule an exam. You would probably have to look into doing an intensive teacher training workshop and traveling to where it is held. You may have more luck finding an intensive program targeted at the DVIDA certification than the others.