There is a 3rd alternative...
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Why choose Lark or Zulip?
Both Lark and Zulip offer basic features such as chat, file sharing, mentions, and 1-1 video calls. However, Lark offers more advanced features such as breakout rooms, participant permissions, and online document editing, while Zulip offers features such as whiteboarding and screen sharing. Lark also provides more support options with dedicated CSMs and multiple training resources, while Zulip offers more integrations and API options as well as the ability to operate on-premise. Overall, both Lark and Zulip have their strengths and weaknesses, and the choice between the two would depend on the specific needs and priorities of the user.