I use a 2.25" wide binding and DON'T press it in half. When I machine sew it on the front of the quilt, I use a scant quarter-inch seam. Then I fold it to the back and adjust the edge (which is why I don't press it first), so that the binding is full of quilt and there are no gaps or flat spots. I use a combo of clips and tiny dots of Elmer's washable glue to hold the edge in place as I hand-sew the binding to the back.
Having said all that, I admit that I am very particular and detail-oriented about my bindings. Find a width and method that works best for you.