There is a 3rd alternative...
Atolia, the one and only workspace your team needs
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Why choose Mattermost or Webex App?
In terms of pricing, Mattermost offers an entry level price of $10/user/month, compared to Webex App's $12/user/month. Both platforms offer a free version, but neither offer a free trial. Mattermost has support add-ons, while Webex App bundles with other Webex apps such as Calling, Webinars or Events. Both platforms offer roles management and graphic personalization, but only Webex App offers dark mode. Additionally, Webex App offers contact management, workspace and user activity, whiteboarding, and recording, while Mattermost offers unlimited storage and a "Do not disturb" mode.