PBI Report Server version and features...consolidated

The consolidated list of features would just be part of the official documentation https://docs.microsoft.com/en-us/power-bi/report-server/get-started In theory as they release updates they also update the official documentation.

If you are specifically interested in the differences between the cloud service and the on-prem Report Server you can see a list of the limitations for the on-prem server here https://docs.microsoft.com/en-us/power-bi/report-server/compare-report-server-service