I like to use the Apple Pencil on the iPad 12.9 inch (recommended size). It is like I am drawing on a piece of paper. I also use a stand to place the iPad on a angle for a better position.

Shapr3D is so easy and powerful to use - in combination with an iPad Pro and the Apple Pencil you can easily outperform expensive CAD workstations. Also the navigation using your fingers beats every space mouse.

Being able to create, bend, modify bodies so smoothly.