What strikes me when thinking about these two supposedly very different points of view on quantum mechanics is that I’m having trouble seeing why they are actually any different at all.To the extent that they are just interpretations, there is no substantive difference. With disputes about the definitions, this is not so clear.
Here are a couple of the better comments:
They difference is in the part that you don’t want to discuss, which is that Everettians postulate the other worlds are real, while Copenhagenists refuses to say anything about what cannot be observed.Woit goes on to review Sean M. Carroll's new book, which is a 368-page argument for the Many World Theory of quantum behavior.
Good old books inform that the same issue had been fiercely debated around 1926, when Schroedinger/Einstein wanted to describe everything via a deterministic local equation, getting rid of quantum jumps. Heisenberg/Bohr explained that it’s not possible because we see particles as events. Decoherence and all modern stuff allow to understand better but don’t change the key point: we need probabilities. So the Schroedinger equation is just a tool for computing probabilities in configuration space.
Woit says Carroll is a good writer and explainer, but the Many Worlds stuff is the babbling of a crackpot. They theory is so silly it is hard to take anyone seriously who pushes Many Worlds.