I buy a big cone of neutral and gray of any name brand thread for piecing. I like Connecting Threads big cones, Superior, YLI, FilTec, Sulky, Guttermann, whatever is on sale for the best value. I like Glide thread for machine quilting I like Bottom Line for my bobbins but recently found InvisaFil thread. It's very thin and strong, perfect for bobbin and works great for machine quilting. It sews like YLI silk thread. There are so many good thread for sewing, it's all a matter of what you and your machine likes.