How does darktable compare to RawTherapee?
That would be a question I’m not in a position to answer acurately. On first trial, I found Darktable more ergonomic and easier to learn than RawTherapee. (and that is NOT a compliment to RawTherapee!)
@buddingphotographer or another member might have some more useful comments than what I could give you.
I will say that Darktable has fulfilled all my needs as a amateur hobbyist.