I know there are browser fans who have a preference of UI or companies etc etc, but the answer to the question of why so many people choose to fork Chromium to

I know there are browser fans who have a preference of UI or companies etc etc, but the answer to the question of why so many people choose to fork Chromium to make their browser distro is solely based on the fact that it's technically the best browser engine out there and to fork anything else would be putting you at an immediate disadvantage compared to forking Chromium, so you'd start with the best and then extend it from there.