My take on the mormons: crack smokin' wackass belief system for sure, but, as a group, not as insular and punitive towards dissenters as JWs are, and I don't think that the leadership constantly howls about their authority and rages on and on and on about apostates the way the JW leadership does. Although I do believe that plenty of former Mormons are shunned by their family and friends that are still active in the faith, shunning isn't such a freaking INSTITUTION among mormons the way it is among the dubs.
My take on scientology: be GLAD that it was JWs, and not these crazy nazis, that you made your escape from. The low internet activity among ex-scientologists is probably because there really aren't that many of them overall, as Scientologists, by outsider estimates, only number about 100k-200k worldwide.