Well you are comparing Revit Structural Suite(RSS) to AutoCAD Architectural(ACA) which are completely different tools depending on the work you are doing. Structural guys are rarely visual so there is definately less of a focus on visualization of their information when comparing them to an Architect. With RSS you get Revit Structural, Structural Detailing and plain AutoCAD. Revit Arch Suite (RAS) has Revit Architecture, AutoCAD Architecture, and plain AutoCAD. There is also a Visualization Suite which has Revit Architecture, 3ds Max Design, Navisworks Review, AutoCAD Architecture, and plain AutoCAD. So many choices and different prices. Best of luck!