I don't see actual numbers for comparison anywhere. Slack has published concurrent users count while Teams has published DAU, which are obviously different.
Previously when I’ve been at them they where on Slack, more recently they use Teams.
People complain about using Teams compared to Slack but Teams seems good enough for the people paying for Slack to decide to stop using it.
Teams being bundled with Office 365 is a huge value proposition. It’s not a case of who’s best, Slack seems more useful but can never compete with free which Teams is if you already have Office 365 which most large orgs do.
Teams video chat is way better than Slack also which may of helped this past year with working from home.
I'm not saying this is the case, but just because Teams is free doesn't mean people won't pay for a better alternative.
Clearly there are examples of free office software suites that nobody uses because Office365 is so much better that it's worth the cost.
(Despite having both Teams and Slack the people at my workplace keep spontaneously switching to Telegram because it's cross-platform and very fast, despite being the worse chat app on every feature metric. Yes, it turns out performance and portability is a huge value proposition for endusers if you actually give them the choice.)
It also doesn’t register a “hair on fire” problem. Slack still has the preconceived notion of being a chat app. And those are not worth the huge investment, compared to problems that truly keep you awake at night ie. Cybersecurity
> In its letter, Slack warned Microsoft that “Slack is here to stay,” adding, “We’re just getting started.” But the 4 million users it had at the time would increase to just 12 million four years later, while Microsoft — which added Teams to its 365 bundle without increasing the price — took Teams from zero to 115 million users.
Hardly anyone even knows slack exists. Everyone knows and uses teams.
Teams isn't a complete subset of M365 though since you can have guest users from outside the org which would count towards the DAU
What you're missing is that M365 is huge in enterprises. Last stat I saw is they've hit 90%+ of the Fortune 500.
These are huge corporations that already have tons of MS.
Teams however definitely didn't win the small business/startup game where tools are actually chosen based on functionality (and where end-users have a say in which tools to use) and Microsoft's market-penetration is lower or non-existent (so the bundling of Teams with Office 365 has no effect). In these cases, Slack wins by a large margin on functionality and performance alone considering how bad Teams is.
The main argument was that Slack for 13k employees was incredibly expensive, while Teams was 'free' and already integrated into most of their infrastructure.