Banned
I believe that one of the most useful elements of the Discord versus a forum topic in this age is that it adds the urgency and emphasis to post. I have spoken to this issue extensively in the past so I will not harp upon it as much as I perhaps should, but there exists a tremendous issue at this time where in the roleplaying community there is less an importance on the delivery of timely responses. Now I have heard no shortage of argument about people being busy is why - rest assured I do not like excuses either way - but one of the superior elements that Discord offers is that people tend to be active on it for more than just their roleplaying server.
Without them making themselves invisible, this allows the use of mentions they are likely to see, which should spur to them the need to get under way and not leave others waiting. Granted this is not always successful, I have found this to be more successful then the mentions used on the forum, as that requires actually already being present and online to see them, meaning they were being active regardless although potentially procrastinating.
Personally the topic of formatting will never get to me, a post is a post so far as I am concerned and the only critical elements needed are the ability to bold, italicize, or underline text. Books themselves are seldom any different, thus unless a roleplay requires that as part of their flair, a matter of how they do business, that is of little consequence. As far as character limit goes, copy and paste, then return of the system is more or less a minor inconvenience.
I would much rather more active members, more posts, and the capacity to engage in near instantaneous communication, in and out of character, over the alternatives. Forum roleplay is in relatively dire need of participants getting their acts together. As such, I will still engage in both.
I challenge the urgency point. I've been RPing on that medium for six years now. And virtually everyone I know has an 80-90% ghost rate. I do agree with its usefulness for ooc interaction. To me, the best is a hybrid. Discord for ooc, a forum for RP.