The republic does not define the best speech according to and supporting life, liberty and the pursuit of happiness so government can empower it balancing commerce’s impact on unalienable right of the people.
With aspects of the very best speech supporting life, liberty and the pursuit of happiness, recognized defined and agreed effects of speech, written into a revision of the 1st Amendment, government, making a clear description of what speech gov must support and empower to protect the unalienable, retained rights that insure life, liberty and the pursuit of happiness. What if such a list existed in 1744, but was intentionally removed by elements controlled by torys? Would you recognize its relationship to the constitutions intent and natural law of human nature if you saw it?
Great topic, but I'm a bit confused about your question. What do you mean by "best speech"? How does commerce tie into this?
I, too, am puzzled by the term, "best speech". Parenthetically, I find it to be pure AGONY to listen most Americans speak at all in 2019. What passes for spoken English in this country, especially templated in the inflectionless, lilting, ubiquitous monotone of today's 'newspeak' -- ending almost always in the maddening finale characteristic of "uptalking", drives me f*cking CRAZY! This monosyllabic gibberish, usually delivered at a hundred miles an hour is how people speak to each other now... especially Millennials and Gen-Z'er's. Ah, Bill Buckley, how I miss you.... . "I mean, like, you know, like, uh, I mean, like, you know...."
Just taking a shot at "If all speech is free, is all speech equal?- Value for the republic." Free speech is a recognized, valued, prized and an enumerated Constitutionally protected right enjoyed and suffered in the Republic of the United States of America. As to the content of all "speech" being equally valued? I would say no. I do not value all speech content equally. Do I value every citizen's right to free speech equally? Yes.