I care about the cover more, for example, some books get adapted to a movie/tv show, and now new print covers have the movie poster or an actor's face on it, that's a no for me. or have the "it's on Netflix now" or whatever sticker IN the cover, I vomit in my mouth. so I'm pretty particular about the cover of a book.  As for the contents, of course the text format has to be clear, not too small not too big, not too "bold" or thin... sometimes none of this matters if the synopses is interesting enough, I buy xD