We prefer SSRS, because we use some versioning system.

When someone changes an existing report with Report Builder, you aren't able to retrieve the previous version (unless they will save their changes to a new report).

When we make changes through SSRS, thanks to our versioning system, we can always go back to the previous version if we want.

I think this is an important difference for a lot of people, certainly for us 🙂 !