There is a 3rd alternative...
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Why choose Slack or Spike?
In terms of communication features, both platforms offer chat, file sharing, mentions, voice messages, groups/channels, GIFs and emoji, threads, and 1-1 and group video calls. However, Spike lacks the ability to poll users, while Slack offers this feature. Additionally, Slack offers whiteboarding, recording, and subtitles & translations, which are not offered by Spike. Both platforms offer user profiles, storage, notes-taking, calendar, task management, and "do not disturb" mode. However, Slack also offers online document editing and document management, while Spike offers newsfeed. Finally, Slack offers integrations and API, on-premise deployment, and two-factor authentication, which Spike does not.