Seems they’re both from the same developer, with slightly different objectives. However, uMatrix’s repository has been archived and hasn’t updated in years. Even if you use a fork, the first line of the README is “Definitely for advanced users.” I don’t consider uMatrix a working solution for the average user, which is most people.

I don’t feel like engaging with the first phrase of your comment as it is, lacking even a single concrete example or further resources to look into.