Quilters select rulers and mat. I have several different sizes of Olfa which I will keep. When visiting my sister over the holidays, I got a good price on QS mat, cutter, and ruler to use while visiting her. I already had the large 24" one that I use constantly. Recently I ordered 2 more of the QS rulers. I really, really like the rulers. Like everything else it's whatever you happen to like. QS rulers do not slip. You can turn fabric when cutting if you are using the ruler and mat together. Nice feature. It seems like the mats all last quite a long time so if you are going to invest, I'd go with the QS.