There is a 3rd alternative...
Atolia, the one and only workspace your team needs
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Why choose Bitrix24 or Lark?
Both platforms offer contact management, chat, file sharing, and 1-1 video calls. However, Lark has additional features such as threads, breakout rooms, and AI-powered meeting transcription, while Bitrix24 offers add-ons and roles management. Bitrix24 has the advantage of on-premise deployment and SAML/SSO authentication, while Lark offers up to 1TB of storage and participant permissions. Overall, both platforms offer similar features and it ultimately comes down to the specific needs of the user.