@Likewise@bookstodon I usually prefer "random books" -> it is a chance to discover things I would not have discovered on my own. A good example was, when I was gifted with "The Night Circus" by Erin Morgenstern. I was completely unaware of it, but loved it once I dived into it.
One limitation to this: it requires care by the one making the gift, they have to know you good enough to know what is not an option. So if you are not sure enough, the voucher is better.