I also us the ANA Grading Guide, but folks must keep in mind that each TPG as their own, proprietary grading standards that they attempt to adhere to with submissions. Learn the ANA standards and then learn the TPG standards for those series and grade ranges that are relevant to you.
In my opinion, CAM, DCAM, PL and DMPL are much more meaningful to the description since they, in theory, apply to the entire coin.
I use Photograde with The Official ANA Grading Standards. I've used those for many years and they have worked quite well for me.