I'm not sure why I didn't notice this before, guess the answer is still moving up the learning curve.....
Adding a highlight to a verse or word appears to be the same as adding a note to a verse or a word. The only difference I see is how the text is marked up. Notes leave a marker with the selection and highlighting leaves however you've defined the marking for the selection. But with both, you can insert text in a note field. I've been adding highlights and notes, sometimes both to the same verse, sure doesn't seem like that needs to be done anymore.
The question, are there advantages of doing it one way or the other? Or is it just user preference? It kinda looks like Visual Filters works with either, is that correct? Am I missing something?