Earlier quoted context omitted.
Judo is good for learning to fall, otherwise not that much IMO.
I disagree. I was by far the smallest kid in my grade, but I took a couple of years of judo when I was 7. It was really useful as I grew up. A big equalizer for me. It does give you an intuitive sense of how to move and a shift your weight in your favor. Even if you fall, you end up falling on top of the other kid. As an adult and for personal defense I think Judo comes right after BJJ and wrestling.
Lots of close contact will mean you're far less likely to panic in a fight situation. Most people have never been in a fight let alone hit.
Plus the fitness of course. Judo helps enormously with core strength.
BJJ borrows a lot from Judo, particularly the grappling.