are you hand or machine quilting? often for machine people set their stitch length a little longer than what they piece with- for hand quilting it depends on you- size *length* is not as important as consistency- as long as the stitches are all the same size- top & bottom- it will look good; people's quilting gets smaller/better with time & lots of practice. it doesn't make a big difference if you are doing stitch in the ditch or fancy feathers in blocks- the stitches should all be consistent- as close to the same size as possible- what size that is depends on what YOU like