I personally like Slack better for the integrations. As a developer, it's nice having bamboo build status and errors coming up after each commit for our automated deployments. Overall, I just feel like Slack is a cleaner UI for chatting and private messages. I'm not using the paid version though, so maybe they have collaborative tools I'm not leveraging.
Teams is great for the file sharing/collaboration on documents, but I don't use it for the chat functionality as much. I just don't prefer the UI. I've had issues with the app on mac and generally have to use the browers version for document collaboration. It is generally preferred over slack because it's included in our microsoft 365 subscription.
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