I use 3D to present them for the clients because of the realistic; but any way i always start with a freehand sketch to have a clear vision, and i keep it after that for my portfolio.
I would like to prefer 3D Max and Photoshop. Freehand sketching was the good method but now a days everyone like reality and good graphics. But before starting any work I would prefer freehand sketching for me to save time.