Dynamics 365 has a modular licensing. This means that you can cherry-pick products and services and pay for what you pick.
You can upgrade & downgrade depending on business needs. (Certain restrictions from Microsoft may apply)
Dynamics 365 also has its own “app store”, similar concept as Apple/Android app store. You can tailor your Dynamics 365 with add-ons. (Add-ons may incur additional costs)
Dynamics 365 is cloud based, meaning, all you need is internet access, and you are good to go! No need to host in house does not worry about infrastructure issues!
Various product/solution offerings to fit your business. At the time of writing, Dynamics 365 platform offers:
Finance and Operations / Business Central
Sales
Customer Service
Marketing
Project Service Automation
Field Service
Retail
Talent
Artificial Intelligence & Business intelligence / Reporting
Mixed Reality
Integration to Other Microsoft Products (Office, SharePoint etc)