We have had a Slack, Rocket chat and Discord in the past.
They are worst solutions for troubleshooting or support. They are ok, if the project is only-one-goal-oriented (coins in most). They usually have only miners and traders.
The Storj network and Tardigrade are more storage-oriented and offer a real service, so the discussions are much more wide than hodl/sale/pump/dump usual themes for only-coin-oriented projects.
So, we decided to use a forum instead. The Discourse is working in real time like a chat, but have a much better experience for support or troubleshooting because of possibility to have separate threads for every discussion and ability to split or join them, give links to threads and much more (voting, announcements, community-driven moderation, etc).