The thread above was mine when I had a similar question.
There’s basically Stable, Beta, DevEd, and Nightly.
Nightly is self explanatory but Beta & DevEd is where my confusion was. Both are on the Beta channel and with the introduction of Quantum they’re both very very similar at this point. DevEd comes with a few different settings checked and cosmetic changes but it’s my knowledge that both can be setup the exact same way and since both are on Beta channel will have the same features.
These features will hit Stable November 14th. Once Stable is on Quantum I’ll go back to using that as my daily browser, I can’t stand old Firefox right now after experience beta. I have DevEd and Nightly installed as well for developing on.