I'd also opt for Discord (well, that's actually what I did for the Endel community: https://discord.gg/endelsound)
They've been developing the platform with a focus on communities, so you'll always have social / fun / fancy features to experiment with. The bots (or internal apps) are also worth checking out.
Choosing between Slack and Discord? Our feature comparison and analysis will help you determine which platform is best for your business needs.
https://www.troopmessenger.com/b...