I've narrowed it down to these two - can anyone give me any tips or convince me to use one or the other? I know Joomla is free and Subdreamer is not - that I don't care about. I want to know about features, etc.
Joomla, hands down. The subdreamer community has dissolved bigtime as the years went by. Too many bugs and issues with that CMS, at least in my opinion. I've used it for a few years and found that it is too outdated for today's demands.