I don't believe there is a 'right kind' of thread for sewing or quilting, unless one is doing a special technique, like hand embroidery. Those who do artistic thread 'painting' use all sorts of thread. Teachers and shops will tell us there is, mainly because that's what they sell. It's the same with artists paints and the like - and they generally cost more as well. My machines use whatever I have at the time, and I have had no problems with any.