I think the main difference here is how deep and how much detail people want. If someone wants a crash course in a period of history, then watching a couple of documentaries will probably suit them better. Yet, if someone wants a proper understanding of a period of history, then they will need to read a book. People only have the attention span to watch TV for an hour or two, so documentary makers need to squeeze in as much as possible, which means they have to skip things. Books though don't have this problem, and they can cover far more.
我认为这里的主要区别在于人们想要的深度和细节有多少。 如果有人想要了解一段历史的速成课程,那么看几部纪录片可能更适合他们。 然而,如果一个人想要正确理解一段历史,那么他就需要阅读一本书。 人们的注意力只能看一两个小时的电视,因此纪录片制作者需要尽可能多地挤出时间,这意味着他们不得不跳过一些内容。 而书籍就没有这个问题,它可以涵盖更多的内容。