There is a 3rd alternative...
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Why choose Nifty or Lark?
Both competitors offer similar features such as roles management, contact management, chat, file sharing, mentions, groups/channels, and integrations/API. However, Nifty offers graphic personalization, custom domain name, and 1-1 video calls, which Lark does not have. On the other hand, Lark offers features such as group video calls for up to 500 people, screen sharing, audio call, breakout rooms, recording, and subtitles/translations, which Nifty does not have. Overall, Nifty seems to be a more affordable option with a wider range of features, while Lark offers more advanced features for larger teams.