There is a 3rd alternative...
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Why choose Element or Zulip?
Both platforms offer a free version, but neither offer a free trial. Element has add-ons available, while Zulip does not. Roles management and custom domain names are available on both platforms, however, Element allows for contact management and Zulip offers workspace and user activity monitoring. In terms of communication features, both platforms offer chat, file sharing, mentions, groups/channels, GIFs and emojis. However, Element offers voice messages, polls, and threads, while Zulip offers 1-1 and group video calls, whiteboarding, screen sharing, audio calls, and recording. Zulip also offers participant permissions, subtitles and translations, newsfeed, and "do not disturb" mode, while Element offers document viewer and training resources. Both platforms offer mobile, web, and desktop apps, as well as integrations and API, on-premise hosting, SAML/SSO authentication, and end-to-end encryption.