There is a 3rd alternative...
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Why choose Slack or Zulip?
Both platforms offer a free version and roles management, but Slack has more features such as add-ons, graphic personalization, and contact management. Zulip, on the other hand, offers whiteboarding, participant permissions, and document importing from other platforms like Slack, Gitter, Mattermost, and Rocket.Chat. Slack has a slightly higher entry-level price of $7.25/month/user, while Zulip's entry-level price is $6.67/user/month. Overall, Slack may be more suitable for global businesses while Zulip may be a better fit for open source and tech companies.