I use Organ needles most of the time and 90/14. Sometimes Schmetz, same size. I only piece and quilt with a very rare mending job on something heavier, lighter, or stretchier, in which case I change needle sizes. I found a huge amount of Organ needles (10 packs of 10) for a ridiculously good price on Amazon about six months ago. I change needles after every big project.