Brewed vs regular soy sauce : phytochemical content
AFAIK, "brewed" is the term used for naturally fermented soy sauce compare to faster fermentation using chemicals; remember that using chemicals is not automatically bad.

https://www.epicurious.com/ingredients/how-to-buy-soy-sauce-like-a-pro-article

As for the phytochemicals (stuff in plants) I don't have a clue.