I have used onenote on my android tablet extensively for the past 2 years for my college notes and I am continually frustrated by the experience. Converting notes to pdfs is more convoluted than it should be, since you need to "share as pdf" then share it with yourself. The app "forgets" pen strokes soon after you make them and makes recovering lost progress frequently impossible. You cannot make straight lines or simple shapes. The only reason I still use it is because most of my notes are here