I have several different sizes/shapes and use them all. I use the 4x14 for cutting binding strips, it's easier to handle, 9.5" square, 12.5" square, 6x18. When I am cutting lengthwise I use my 6x24. I've also got a few others, triangles, scallop, smaller squares. The smaller ones are good for trimming when paper piecing. Each one has it's own job to do. :)