I use pencil, pen and marker pens, to highlight and I sketch, it makes no difference what, I have an idea I note it, and if required sketch, the highlighter pen is used to define. Be careful, the marker pens tend to bleed through the paper.
I keep looking at Google Keep and so far it's just no where near Evernote, no OCR, I tend to test this witrh screen grabs i take of ebooks, but to date no OCR on the photos I have taken, But saying this, I tend to copy notes made into google Doc via iFTTT, a free cloud based app that looks and if it see's a new not copies it to Keep,,,,,, just in case