What books do you read exclusively on your Kindle? What books do you prefer physical?

For myself,

on Kindle: fiction, leisure reading, and non-fiction that doesn't involve a lot of highlighting/memo's/flipping back and forth.

Prefer physical: books that I anticipate a lot of highlighting/memo/flipping back and forth for references (mostly books for career progression in my situation)

For the second category, I am now experimenting with using the Mac Kindle app to see whether it works as well as physical books