What tool should be used to create a sloped roof in Revit?

The tool that is most effective for creating a sloped roof in Revit is the Slope Arrow. This feature allows users to define the slope of a roof element accurately by placing an arrow that indicates the direction and degree of the slope. When using the Slope Arrow, Revit updates the roof geometry to reflect the designated slope, making it straightforward to create designs that meet specific architectural requirements.

While Shape Editing provides the means to modify the geometry of roof elements, it's more about altering existing shapes rather than initially defining a slope. The Variable Thickness tool is typically used for controlling thickness in materials rather than addressing the roof's slope itself. Defines Slope can be relevant within certain contexts for adjusting the slope, but it is not a dedicated tool for creating the slope from scratch like the Slope Arrow.

Therefore, the Slope Arrow is the ideal choice as it directly facilitates the creation of sloped surfaces in a clear and precise manner.