Yep! This is the first time I’m hearing the claim that hardcover matters more for bestseller lists; but I do believe hardcover preorders matter a bit more than audiobook preorders (which matters a bit more than ebook preorders). I was assuming the mechanism for this is that they provide different amounts of evidence about print demand, and thereby influence the print run a bit differently. AFAIK all the options are solidly great, though; mostly I’d pick the one(s) that you actually want the most.
Yep! This is the first time I’m hearing the claim that hardcover matters more for bestseller lists; but I do believe hardcover preorders matter a bit more than audiobook preorders (which matters a bit more than ebook preorders). I was assuming the mechanism for this is that they provide different amounts of evidence about print demand, and thereby influence the print run a bit differently. AFAIK all the options are solidly great, though; mostly I’d pick the one(s) that you actually want the most.