There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
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Why choose Monday or Rocket.Chat?
Monday.com offers more features such as roles management, graphic personalization, contact management, and mentions. On the other hand, Rocket.Chat offers chat, file sharing, voice messages, groups/channels, GIF and emoji, and threads. Both tools have mobile, web, and desktop apps, integrations and API, SAML/SSO authentication, end-to-end encryption, and two-factor authentication. However, Rocket.Chat also offers on-premise installation and data and user import from Slack or CSV. Overall, Monday.com is a better choice for project management, while Rocket.Chat is more focused on communication and collaboration.