The differences between these theories are of primarily theoretical interest; they overlap sufficiently in practice that the practical implications of utilitarianism are unlikely to depend upon which of these turns out to be the correct view.
But you don’t substantiate or explain this. As a helpful suggestion, you could add a line later on pointing out that, if the different theories will agree, in practice, on which things make life go well vs badly, they are likely to agree about what sort of practical actions are good vs bad. However, different theories of well-being may well disagree on what the priorities are amongst actions, and one would need to get further into the details to investigate this.
Regarding the well-being section, you say:
But you don’t substantiate or explain this. As a helpful suggestion, you could add a line later on pointing out that, if the different theories will agree, in practice, on which things make life go well vs badly, they are likely to agree about what sort of practical actions are good vs bad. However, different theories of well-being may well disagree on what the priorities are amongst actions, and one would need to get further into the details to investigate this.