Do you prefer digital or physical books?

Digital. I live in 76ft² and can no longer store thousands of physical books like I did in a “sticks and bricks” house. But there are ~13,000 easily stored between the e-ink kindle and waiting in the wings in calibre.

Reading is a big part of my retirement plan.

I haven’t investigated, but I’d give digital books a shake if I could find a solution that doesn’t put control of my library in the hands of Amazon or similar, phone home for analytics, etc. I don’t object to the idea in principal. But until I feel safe doing it, I’m still reading physical books.