Generally, I cut my binding straight, lengthwise of grain, unless there are curves or scallops (and I stay away from them if I can - lol!). If I have curved/rounded corners, I do true bias. I cut the binding 2-1/2", double-fold and stitch to the front, and turn the folded edge to the back, hand-stitch. The reasons I cut binding lengthwise of the grain are: It's far easier to cut it straight, and lengthwise of the grain doesn't stretch, and there's fewer pieces to stitch together (bias seam). I use the method demonstrated by Jenny Doan, MSQC, in her video(except that I cut my binding lengthwise of the grain), and find that my bindings are (almost) perfect.