physical book
kindle
The e-book allows me to adjust the text display settings to my liking: to select the typeface, to enlarge or reduce the text. This is very convenient for people who have problems with their eyesight. You can simply increase the size of the font and do not suffer, parsing small letters. Unfortunately, paper books cannot provide such an opportunity - here it all depends on the publishers. Although if I really like an e-book, I definitely buy a paper copy and put it on the shelf.
I prefer books, so I've counted 12 physical books on blackjack that are reputable. But 1 advantage of .pdf format books is that you can convert them over to text to speech to do other things while listening. I really find it helpful when reading stock market books that can be a bit boring to read manually.
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