There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
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Why choose Spike or ChatWork?
In terms of features, Spike offers more customization options such as graphic personalization and custom domain names, while ChatWork offers more storage (from 5Gb to 10Gb/user) and has more robust task management capabilities. ChatWork also has better integrations and API capabilities compared to Spike. Overall, both tools have their strengths and weaknesses depending on the needs of the user.