It depends about what you need. Rocketchat is mostly a clone of Slack for a quarter of the price. Teams may not be the exact solution but brings Sharepoint, O

It depends about what you need. Rocketchat is mostly a clone of Slack for a quarter of the price. Teams may not be the exact solution but brings Sharepoint, OneDrive and Outlook into a same place. For most companies using Microsoft 365 is great as you can comply with security policies and easily collaborate and join meeting groups with other companies without extra accounts. Slack works fine for engineering teams, but still very expensive and not much professional for the corporate world.