I think it depends if you want the quilting to be used to help decorate the quilt or only to secure the batting. I usually use invisible thread when I do SID and thread that matches the backing on the bobbin. When I do FMQ I use a complimentry thread on the top and usually a matching thread fon the bobbin. complimentry meanng one that will go with the quilt top. That can mean contrasting or blending thread.I usually picl a thread that is the main color of the quilt top. I think verigated thread will probably look nice on a white.border. Aslo you can use more than one color thread. Verigated in the border and other plain color in the main part of the quilt.