A Power BI Report Server is 100% compatible with SSRS. A Power BI Report Server can be thought of as a superset of an SSRS server in the sense that both modern Power BI reports and all SSRS features through the latest release of SSRS are included. Therefore, it's not necessary to deploy both an SSRS report server and a Power BI Report Server to support existing SSRS workloads.
"There is no reason, except in some edge cases, for you to be running both SSRS and Power BI Report Server."
– Christopher Finlan, Senior Program Manager for Power BI Report Server
It's certainly possible to deploy the Power BI Report Server along with an instance of SSRS. For example, the Power BI Report Server could be dedicated ...
