I look at the difference between paginated and mobile reports within Reporting Services 2016. Mobile reports are new with SQL Server Reporting Services 2016 and you may be confused as to what they are as compared to paginated reports.
Paginated Reports
Paginated reports are operational reports that allow for a more traditional report experience.
Mobile Reports
Mobile reports are dedicated reports optimized for a wide variety of form factors and provide an optimal experience for users accessing reports on mobile devices.