There is a 3rd alternative...
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Why choose ClickUp or Rocket.Chat?
In terms of communication features, both ClickUp and Rocket.Chat offer chat, file sharing, mentions, groups/channels, gifs and emojis, and threads. However, Rocket.Chat has the advantage of offering voice messages, 1-1 and group video calls (with integration needed), and a "do not disturb" mode, while ClickUp does not. ClickUp offers task management, online document editing, and notes-taking, while Rocket.Chat does not. Both ClickUp and Rocket.Chat offer mobile, web, and desktop apps, integrations and API, and SAML/SSO authentication, but Rocket.Chat has the advantage of offering end-to-end encryption and two-factor authentication.