Since a serger uses so much thread per inch the thread is usually of a cheaper manufacture process and is spun in a rougher finish than other sewing thread. I take advantage of this aspect of the thread and buy serger thread that is on sale in the color that I want regardless of brand. The only exception is a Bernini special thread for the bottom looper that is much thicker and is used for a satin stitch appearance. I think they are the only company making it. I have never been able to tell one cotton serger thread brand from another either in the way it performs on my serger or in the way it looks. When I use special threads, I select according to the effect I want not according to the brand. I hope this helps.