Meandering overall would be very pretty. If you use a darker thead on white, it look spidery. So I would use a light thread not necessarily white. It is hard to see where you have been if you use exactly matching thread, so if you use a thread not pure white or even a very pale blue, you will see it to quilt and know where you have quilted, but it will not show up and take over the quilts or look spidery A very pale varigated would be lovely