3D printing leaves a soft texture on every print, Processed is best described as the texture of an egg shell. Premium plastic still has a slight texture, but it's glossier and slipperier, meaning skin will glide across it a little easier. MJF PA12 is printed at a finer layer height, and offers a very smooth finish without any post-processing. Depending on your personal preference, any of them could need sanding. Some people like the grip, some people want it smooth. Shapeways goes into detail on those questions here