The use cases are a bit different. Slack is more of a chat application and is good for synchronous or slightly asynchronous communication. Brainstorming or asking a quick question for “right now”. Discourse tends to be better for questions with answers or discussions with information that might be long lived. In some ways they’re converging on each others spaces (Slack now has a pretty good search facility) but in general each has its own strengths, but also requires people to seed it with content to keep it interesting.
1 Like