I like the look of decorative stitches on the edges :D
Depending on the over all look of the quilt, you can sew the stitches up close to the edge, right on the edge, or 1/2 on and 1/2 off... There really aren't any rules, it is more according to the look you are trying to achieve.
I like looser decorative stitches or the applique stitch better than satin stitching, it keeps the fabric/quilt softer feeling JMHO :D:D:D