I am a college student. I use notability for annotating lecture slides in class (I use a macbook and wacom tablet). It’s one of the few apps I found that does direct handwriting annotation well.
The only things I would request is the ability to have multiple windows open so I can work on two notes at a time and to have add function to the eraser so it can erase parts of lines.
JDoggett617 about Notability, v2.2.0