I avoid bias strips like the plague LOL When I have to cut triangles I starch the fabric stiff to keep the stretching to a minimum. It doesn't take much handling, and the edges of the bias cuts want to start rippling...
Straight cuts going selvage to selvage or running parallel to the selvage are your best bet :D:D:D
Often, I will cut my borders first cutting along the selvage side, usually I can get longer strips this way. Then I cut out my pieces :wink: