I used both threads and REALLY like the thread labeled as the one for 'machine quilting'
The other, the poyester did fine, but it was thinner and 'stiffer' if that makes sense. It curled where it wanted to curl, made it harder to thread the needle. It looked ok, but I probably won't be buying it again
Did I say I really like the first one? I picked a variagation of autumn tones, and the colors were just lovely