I've been on web forums for many years, mostly focused on other subjects, not crossdressing. I have found that over the years, participants in these forums have become far less civil (a reflection of society in general). "Hiding" behind a keyboard using an anonymous screen name has enabled folks to pretend they are people they are not, pretend to have knowledge and experience that they don't have, and post things that would get them punched in the face if said in person.
I have also seen forums get "taken over" by a few members who always agree with each other and disagree with any new folks.
In any case, it's important for everyone to remember that this is the Internet and what you read here may or may not have happened and advice you see here may or may not be good advice. If you're asking what color hose to wear with a particular outfit, that's fine. If you're asking about how to save your marriage or if you should crossdress at work, think about the replies very carefully before you act.
I have not joined any other crossdressing forums so I can't speak to them or compare them to this one.