There are several key advantages Bitrix24 offers over Microsoft Teams.
Microsoft Teams is the ultimate messaging app for your organization – a workspace for real-time collaboration and communication, meetings, file and app sharing, and even the occasional emoji! All in one place, all in the open, all accessible to everyone.
On the contrary, Bitrix24 features significantly more different business tools that are already cross-integrated and interlinked, working as a part of a single ecosystem. When you subscribe to Bitrix24, you have all the tools for your company in one place, neatly organized, set up, and ready for work. Bitrix24 offers you CRM, tools for marketing, advanced task management, team collaboration, communication, and business process automation. All covered by one, flat-fee subscription that does not feature per-user pricing.
Teams: per-employee (per-user) pricing
Bitrix24: flat fee (every plan has a user limit. Add as many users as you need within that limit, no additional charge)
* Bitrix24 also offers monthly-long plans if you don't want to purchase the annual subscription immediately
Both services provide excellent security for their customers and data. Bitrix24 has one crucial advantage: if you want to host your data on your own server, you can use Bitrix24 On-Premise version.