I haven’t used a whole lot professionally, but I use Discord all the time socially. I’d say its a great “social organizer” or as a tool to use when planning things with multiple people, especially travel plans and such. It’s also the go to for a lot of companies as their community outreach hub. Other than that Slack seems ok… I don’t see what all the major buzz is about and seems to be maybe a little too “flexible” or something for its own good. That being said I see integration options for slack in pretty much every productivity app/tool I see now a days. Then again everything seems to be becoming much more modular now and allows for widget installations.