King Tut is highly recommended for machine quilting. I also like Sulky Blendables but it is expensive. For piecing--I use Coats & Clark Dual Purpose--cheap, not as linty and strong enough. I use prewound bobbins which are a thinner thread and that helps out a with the seams. I do NOT have good luck with Coats & Clark Machine Quilting thread--especially the variegated cones. I have been able to use the solid colors but I often have to liberally apply Sewer's Aid to the cones. King Tut & Robison Anton Cotton Machine Quilting thread flowed through my quilting machine like butter.