I think you are right in terms of forum-based communities having more in-depth discussions due to the way that in a forum, new replies bring threads back to the

I think you are right in terms of forum-based communities having more in-depth discussions due to the way that in a forum, new replies bring threads back to the front page, whereas on reddit, after a few days, no one is posting on old threads. For this reason, I think reddit really shines for communities where there is time sensitive discussion around news and for getting a perspective on the latest happenings. So it really just depends on the topic area...