I use both threads in my longarm (and in my DSM), depending on the project. CT has a poly for longarms that is very good, and I also like their cotton threads because of the huge selection of color. I also bought a wide range of colors of poly threads from Metro Embroidery, and I use them when I want a shiny thread, which is frequently. All cotton threads are linty to some extent, but cleaning your machine frequently should take care of that. Remember that some of the lint from any project comes from the fabric - so to avoid lint completely we wouldn't be using cotton fabrics! Oh my!