I love Superior Bottom Line and So Fine. They work wonderfully as both bobbin and top thread, and you can get a lot on a bobbin. They are truly beneficial in getting that scant quarter inch seam. As suggested by someone else, go to their website. There is a lot you can learn, and they sell sampler packs of thread so you can try out a variety. I would suggest not stockpiling. Your tastes and needs will change over the years and you won't want to be stuck with earlier purchases that you are not using.