They aren't really competitors. The various acronymed players in the world of public radio are just different heads of the same Hydra. All of public radio is colloquially (though technically incorrectly) referred as "NPR", just as all adhesive bandages are called "Band-Aids" and all facial tissues are called "Kleenex". Technically, using the leading brand name to describe all products in a category is an error. But only a pedantic nit-picker or someone who works for the brand name and wants to protect it would make a big deal out of it.
I suppose Premiere, TRN, Salem and Citadel are also heads of the wing-nut echo chamber hydra?
And how about all those liberals who still call progressive talk radio "Air America," despite the fact that they are out of business, and even when they were in business the leading progressive talk shows never came from AAR.
Maybe you are one of those people who asks for a Coke and can't tell if they give you Pepsi.
Maybe talk radio has made you sloppy, imprecise and careless in your use of words and given you a disregard for the accuracy or inaccuracy of anything you cite as fact, and leads you to call anyone who does care about these things a "pedantic nit-picker."
The fact is the major public radio program suppliers compete for air time and clearances, and there are not enough of either to go around. Sometimes the competition gets ruthless - as when NPR moved the start of All Things Considered for the purpose of driving APR's Monitor Radio off the air.
I realize right-wingers like to think that anything they consider "liberal" is orchestrated by (1) the Kremlin from 1945 to 1990 and (2) by George Soros since then. In your paranoia you give liberals way too much credit for organization.
I don't belong to any organized political party. I'm a Democrat.