Also open to anyone else who has an opinion. Thanks.
How about both? How about "I'm not sure"? Mormons certainly teach that the whole present Church, including the Catholics and everyone else, fell into apostasy and needed to be "renewed." This certainly isn't a "listen to the Catholic Church" attitude. So it can be said that the founders of Mormonism were exercising their right to interpret Scripture without having a Church tell them what it means. Of course the "new" "Scripture" they found throws a monkey wrench into things.
And now that they are established, they have no problem following the Catholic model of obedience to "God's true church."
I am not real sure about the JW's, being fairly ignorant about them, but I think the same can be said. Sola Scriptura was good when they started as a new faith, it is bad now that the "true" Church is established.
SD