There is a 3rd alternative...
Atolia, the one and only workspace your team needs
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Why choose Monday or ClickUp?
In terms of communication features, ClickUp offers chat, file sharing, mentions, polls, groups/channels, GIFs and emojis, and threads. Meanwhile, Monday lacks these features but offers "Do not disturb" mode. As for document management, both offer online document editing, document viewer, and document management. ClickUp also offers notes-taking, while Monday offers newsfeed. Both have mobile, web, and desktop apps, integrations and API, SAML/SSO authentication, and two-factor authentication. However, ClickUp offers on-premise installation, while Monday offers branding removal and "soon-to-come" AI.