I have used Gutermann, aurifil or superior mostly, but I when I have stitched in the ditch and didn't want anything to show I used the Mono Poly wonder invisible nylon thread from YLI. I like that, too. The old invisible thread was hard and like fishing line. This is soft and acts like cotton, but is invisible. I also just got a new brand from my LQS. It is called Algodon Presencia Algodon 100% Mercerized cotton 60 wt. I LOVE IT. There is no lint and it just sews beautifully. So this may be my go to thread from now on.