[D] What are the differences between the major open source voice cloning projects?

So I know of TTS projects like Coqui, Tortoise, Bark but there is very little information on what are the advantages and disadvantages between them in regards to voice cloning.

All I know is it seems Coqui is/was the gold standard TTS solution consisting of models based mainly on Tacotron and is full 'unlocked' with no particular restrictions.
Tortoise and Bark are newer transformer based projects and theoretically at least, can clone much more effectively with much less training. But …

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