If it were my quilt, I would stitch 1/4-inch away from all the seams. I don't like to do diagonal quilting as it is hard to go through the intersections. Also, it is hard to stitch in the ditch, as I can't always stay in the ditch. I wouldn't reommend the 1/4-inch tape, as it gets sticky after using a couple times. I want all my stitches to show, and the best way for me is to quilt each piece 1/4 inch away from the seam. I eyeball it and my quilting lines are pretty consistent. That's the best way for me.