I enjoy ‘how to play’ videos, I tend to watch them before I decide if I want to buy the game or not as it tens to give a nice over view and feel for the game. However, when I’ve got the game in front of me and learning it I prefer the rule books, I find it easier to follow a book as I can go at my own pace and flip backwards and forwards. If I get really stuck, which doesn’t happen often, I will go to the how to play videos again.
I think there is a place for both approaches as people are all different and learn games in different ways, hence why rulebooks can be so difficult to make. I remember watching a review of a game that said the rulebook was one of the best they had seen in years, I read it and thought it was really bad, I didn’t think the order of the book fitted the game and I thought some of the language and examples were ambigious.
Love books at the table, love videos before purchase or when stuck.