Just use uBlock Origin. These details don't really matter to most people.

Actually AdBlock Plus was a fork of AdBlock, by a different person, because AdBlock was no longer maintained.

I suspect AdBlock(er) Ultimate is yet another unrelated extension from completely different people.

It's a similar story with uBlock. I think the uBlock dev wanted to stop, handed off dev to someone else who fucked up. So it was forked into uBlock origin.

tl;dr they're all adblocking software from different people, who don't work together.