There is a 3rd alternative...
Atolia, the one and only workspace your team needs
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Why choose Slack or ChatWork?
Slack offers a free version and a range of add-ons, while ChatWork only offers a free version for up to 100 users and no add-ons. Both tools offer roles management, chat, file sharing, and voice calls, but Slack has additional features such as graphic personalization, custom domain names, and polls. ChatWork, on the other hand, offers group channels, subtitles & translations, and task management. Both tools offer mobile, web, and desktop apps, as well as integrations and API. Slack offers on-premise deployment, SAML/SSO authentication, end-to-end encryption, and data & users import, while ChatWork offers two-factor authentication and users import.