Teams vs. Slack
I do consulting at multiple organizations at a time, and thus tend to participate in multiple Slack and M$ Teams channels at a give time. The biggest difference I see is people actually like using Slack, communicate openly and socially vs. what seems like mere ghost channels on Teams like they're afraid of corporate logging something inappropriate.
Slack seems to invite communication dumping everyone into "General" first, usually with hails of "welcome!", and folks are typically encouraged to find other channels as appropriate to join. There are typically few private only channels, rather it's built more on social inclusion vs. exclusion. People actually enjoy using it both for being social within the companies and for getting work done in some combination of both.
Among even my own team Teams channels, it's almost frowned upon to post non-work items, get rare responses, and all teams lock their own channels to only themselves vs. inviting cross-team collaboration (no networking bofh's in the systems channel, please). There is no "General" channel for everyone to socialize in, no "Pets" channels, no specialized "outside work" interests, nothing. It's all entirely sterile and/or depressing. People only use it for direct messages to each other, and most hate it as a conferencing platform, still using their webex/zoom/google conferencing instead.
This is consistent across every Teams org I've joined.
As much as M$ gives it away, it just as usual misses the mark to clone Slack as much as they would like it to be.
Biting the hand that feeds IT
