SSRS makes it easy to control who has access to your reports and data. It is possible to specify permissions on the whole server, specific folders of reports or on a single report. Permissions inherit down, like a regular file system, unless you explicitly break inheritance to specify custom permissions.
In addition to permissions, you have a central server to house and control your reports. This is critical when you need an authoritative source of truth for your reporting. Users can trust that they are reading the latest version of any given report.
In addition to the administrative side of things, SSRS provides a powerful development environment with SSDT. SQL Server Data Tools (SSDT) is based on Visual Studio, a very popular Integrated Developer Environment or IDE. SSDT makes it incredibly easy to store your reports in source control since your reporting artefacts are just XML files. Source control makes it possible to collaborate on a team or rollback to earlier versions of a report. This is a capability that is not available with Excel or Power BI reports.
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