@csauve, SolidWorks is a prismatic and NURB modeler, just like NX (Unigraphics). It models prismatic surfaces from planes, circles, ellipses, and cones. Complex surfaces from splines are NURB surfaces.
You maybe thinking of Polygonal and Sub-D Modeling like MODO, Maya, and ZBrush.
Fusion360 is a prismatic, NURB and, T-Spline modeler. T-Splines are a different type of NURB surface (I am a bit unsure on this part).
NX has it’s own CAM package (and it is a very nice one). The translation between NX CAD and NX CAM may be superior but the CAD is the same. Another CAM package that translates SolidWorks and Inventor files into smooth CAM surfaces is TEBIS. Also a high-end CAM package.
Try this experiment, export a NX STL file. It will be made of triangles, just like any other CAD package, Prismatic or Sub-D. CAM is different in that the G-Code can be written as an equation by some CAM packages.