I have lots of rulers and mats. Different brands and different sizes. My favorite rulers are creative grids as there is black and white markings. Easy to use on light or dark fabrics and see the correct line for measuring/cutting.
The 5 inch msqc ruler is used to fold smaller pieces in a 5 inch for storage. I don't cut with it. I have two QS rulers but don't like the frost on them as the lines don't show the fabric as well as CG. The marking aren't the best for my eyes either. Yes, I am particular.
Mats have to be numbered left to right. I don't buy the mats with the two number system where the second number is of the opposite direction. There is also a mat under my machine for quick measures (no cutting) if needed.