I like all three of those names. All three are heroes to me in their own ways. Harris is probably my favorite but I don't like is weak argument for not being vegan (in his fairly recent Ask Sam Harris Anything #1 video). I don't like Dawkins' argument either, seen in the video interview with Peter Singer.
I am now reading Harris' The Moral Landscape,
which argues that facts, reason, science, and the concept of well-being are the proper basis for morality, as opposed to liberal moral relativism or conservative religious "morality."
I am only a few chapters in, but Harris does often mention the well-being off conscious creatures, not just of humans. I suspect that he is just trying to pick his battles by not focusing more on animals.
In any case, to a thinking vegan, these 3 are quite important, especially in the USA, because the "biblical" argument in favor of eating animals is sadly so pervasive.
Read Harris' books and you will have plenty of reasoned, thoughtful points to make as to why this religious justification for the status quo is mistaken and quite harmful.