The choice of pins for your tags is a simple matter of taste. Grooved pins have become the industry standard for the vast majority of tags, however WG also offers a smooth pin for retailrs who deal in garments composed of finer fabrics and materials. The tops of the pins come in distinct shapes for you to choose.
Some specialty tags are pin-specific, meaning that one special pin comes with the tag. But overall, you have the freedom to choose which pin best suits your shopping environment.