SSRS 2012 provides two primary design tools for building reports and related objects:
SSDT, a powerful development tool integrated with VS 2010
Report Builder, a simpler-to-use yet no-less-powerful application for designing ad hoc reports
Both tools provide rich graphical design surfaces and allow for a (mostly) WYSIWYG experience, and you can achieve almost all the same results with either. SSDT, however, is marketed heavily toward developers, whereas Report Builder is marketed more at advanced business users.
In practice, Report ...