I like the option of all 3. I tend to read ebooks and soft covers a lot more. If it had pictures I’d opt in for the hard cover.
I tend to read ebooks more often but not out of preference. Simply out of convenience. I hate viewing pictures on ebooks.
Small books are always my preference over large. But again, if it had lots of charts and it was a keeper I’d opt for a large hard cover.
Can’t wait to get this book.