I vote KBO
For the same rezones Ceres, once called a planet, was downgraded to an asteroid. Those reasons where that it is considerably smaller tan all the other planets and more importantly, it is the largest of many similar bodies that share the same region of orbital space around the Sun.
Think of Pluto as the Ceres of the KBO’s.
Whatever we call Pluto, it will always be what it is. We can not change it. What we call it only changes the way we see it in our minds.