For me its Mettler for FMQ- I love the 50 weight and it really looks great when washed up. I get the silk finish 100% cotton. When taking Textiles, I learned that cotton is not as sharp/tough as the man made fibers and then when my Quilting teacher said that if you used cotton fabric and man-made thread it would tear/cut the fibers of the cotton it all clicked. So with cotton fabric, I use a cotton thread.