Paper determines line quality
My first assignment in graphic design class was, "Using a black marker, create a 6" x 6" composition in the centre of a 9" x 12" sheet of bond paper."
The lesson helps to demonstrate how paper and ink interact. Some marker-paper combinations allow a thin clean line while others bleed to enable smooth streak-free area coverage. No marker/paper combination can do both equally well. The nature of the paper determines the line quality.
Artists become aware of this difference and choose their materials according to the effect they wish to use for illustration. Software packages such as Corel Draw and Adobe Illustator try to emulate the effects of different materials and textures with software.
Sketching is usually done with pencils which are by nature, pressure sensitive and whose line can be refined, adjusted, or removed. The sharper the pencil point, the darker the line produced. Different hardnesses can be used on bond paper which is usually a rough and absorbent surface. Markers can cover areas smoothly on matte surfaces. The degree of roughness of paper is referred to as the pic.
Drawing is usually done with a fine line rather than a broad one. Smooth paper lends itself to using technical pens and very fine-line markers for detail. Contrast is enhanced with smooth surfaced papers. Smooth surfaces are harder to erase cleanly and if abused can be damaged. A line drawn through such a rough area is visibly different. Many smooth papers are coated with a white clay (baryta) coating to achieve the surface finish and opacity.
Edit: I also use tracing paper/vellum. It is transparent and allows working (with a marker, say) on both sides of the paper for added versatility. Tracing paper is highly underrated as a working material. To scan work on tracing paper, back it with white.
Note: For other scanning, always use black paper for backing-up to minimize print-through shadows from the back of the scanned page.