The Slack vs. Teams debate usually comes down to one thing: what does your company already use? If you're a Google Workspace shop, Slack probably feels more natural. If you're on Microsoft 365, Teams is already sitting right there. But there's more to it than ecosystem loyalty.
I've used both as my daily communication hub for extended periods. Here's how they actually compare when the honeymoon phase wears off and you're living in these tools eight hours a day.
The Fundamental Difference
Slack is a messaging app that added integrations. Teams is a collaboration platform that includes messaging. This shapes everything about how they feel in daily use.
Slack is fast, focused, and built around conversations. Every feature is designed to help you communicate more efficiently. Teams is broader, integrating chat with video calls, file storage, project management, and the full Microsoft 365 suite. It does more, but each individual feature doesn't feel as refined.
Messaging Experience
Slack wins here, and it's not close. The messaging experience is faster, more fluid, and more feature-rich. Threaded conversations work intuitively. The search is excellent. Emoji reactions feel native. Slash commands, custom emojis, channel organization. Slack makes chat feel effortless.
Teams' messaging is functional but heavier. Threads exist but feel clunky. Search is improving but still not as fast or accurate as Slack's. The interface carries more visual weight, which can feel like friction when you just want to fire off a quick message.
For teams where chat is the primary communication channel, Slack's messaging polish makes a noticeable difference in daily satisfaction.
Video and Audio Calls
Teams wins here, and it's a significant advantage. Video calling is a core feature of Teams, not a bolt-on. The call quality is consistently good, screen sharing works smoothly, and features like meeting recordings, transcription, breakout rooms, and Together Mode are built in.
Slack has huddles (quick audio/video calls within channels) which are great for spontaneous conversations. But for formal meetings, Slack relies on integrations with Zoom or Google Meet. That extra step matters when your calendar is full of video calls.
If your team does a lot of video meetings, Teams having everything in one place is a real workflow advantage.
File Sharing and Collaboration
Teams integrates directly with OneDrive and SharePoint. Files shared in a channel are automatically organized in SharePoint, which means version control, permissions, and co-authoring just work. If your company creates and shares a lot of documents, this integration is genuinely valuable.
Slack handles file sharing well enough, but files live in the conversation rather than in a structured file system. Finding that document someone shared three weeks ago means searching through messages. Slack integrates with Google Drive, Dropbox, and Box, but the files still feel like chat attachments rather than organized resources.
Integrations and Apps
Slack's app directory is the largest in the business. Over 2,600 integrations covering every category of business software you can think of. Notifications, automation, project management, CRM, development tools. If you use it, there's probably a Slack integration for it.
Teams has a solid app ecosystem too, with deep integration into the Microsoft 365 suite (Word, Excel, PowerPoint, Planner, Power BI). Third-party integrations are growing but still don't match Slack's breadth. For non-Microsoft tools, Slack usually has the better integration experience.
Pricing
Here's where Teams has a massive advantage. If your company already pays for Microsoft 365 Business Basic ($6/user/month) or higher, Teams is included at no additional cost. You're already paying for it whether you use it or not.
Slack Pro costs $7.25/user/month (annual). Slack Business+ is $12.50/user/month. For a 50-person team, that's $4,350 to $7,500 per year on top of whatever you're paying for other productivity tools.
The free versions of both are limited. Slack Free restricts message history to 90 days and limits integrations. Teams Free has participant caps on meetings and limited storage.
Which One Should Your Team Use?
Choose Slack if messaging and integrations are your top priorities. If your team communicates primarily through chat, uses a diverse set of third-party tools, and values a fast, polished messaging experience, Slack is the better communication hub.
Choose Teams if your company runs on Microsoft 365. The integration with Word, Excel, SharePoint, and OneDrive is seamless, and having video calling, file management, and chat in one platform reduces tool sprawl. The fact that it's included with your Microsoft subscription makes the financial case compelling.
The honest answer for a lot of companies is that Teams is "good enough" at messaging while being excellent at everything else in the Microsoft ecosystem. Slack is the better chat app, but Teams is the better all-in-one workplace platform. Your team's priorities determine which advantage matters more.