First, I must say, I have not used any of the rulers, so this comment is coming from a different direction.
For the best precision of any log cabin blocks, Jordan's is the place to go. Matt does such precision cutting. All the seams are a scant quarter. Once you figure out where that is, there will be no squaring up at the end.
https://jordanfabrics.com/collections/matts-hand-cuts
Edited to add: As a long time apparel sewer, I have learned that if you cut the logs on the length of fabric, as opposed to going across which is Width of Fabric, you will have much less stretchiness and problems.