There is a 3rd alternative...
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Why choose Nifty or Spike?
In terms of features, Nifty offers more options for communication and collaboration such as chat, mentions, voice messages, groups/channels, and 1-1 video calls. They also have more advanced search capabilities and AI features. Spike, on the other hand, offers more options for document management and editing, including a document viewer and online document editing. They also have a mobile and desktop app available. Overall, both options offer a range of features and it would depend on the specific needs of the user to determine which would be the better fit.