There is a 3rd alternative...
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Why choose Slack or Mattermost?
Slack's entry-level price is $7.25/month/user, which is slightly lower than Mattermost's $10/user/month. Both platforms offer a free version and support add-ons and role management. However, Slack offers more graphic personalization options and allows for custom domain names, while Mattermost lacks these features. Additionally, Slack has more advanced features such as voice messages, polls, and whiteboarding, while Mattermost lacks these features. Overall, Slack may be a better fit for businesses looking for a customizable and feature-rich communication platform, while Mattermost may be more suitable for tech-focused teams.