There is no way I can perceive reading on an expensive device as more comfortable than paper. Paper is fairly cheap, lightweight and resilient; I can carry it around, fold it, toss it aside, sit on it by accident while thinking, annotate it with scribbles, and pour coffee on it with aplomb and finesse. I can flip it, half-tear it in anger, drool on it when I reach my brain capacity. I can take it hiking with me without fear of breaking or losing it. In other words, paper is a tool that gets out of my way.
I did try all the devices you listed above, even had my department pay serious money, and ended up barely using them for all those reasons. I am a mathematician, I am clumsy and I want to focus on my problem-solving; I want to think, and babysitting devices and tools is not what I want to spend my brainspace on.