Honestly, I would choose whatever your most comfortable with. I just started using a darning foot I find swirls the easiest so other then stitch in the ditch or outlines, swirls are what all my quilts get. if you have only stitched in the ditch I would do what ever your comfortable with. I would maybe stitch around the sashing then a swirl or meander in the squares but I'm limited on level of skill!