I am an author of academic book and journal article. The number of books and journal articles I have published are almost equal. However, I found that the majority of post-graduate students who contact me for discussion are my academic books' readers. So I think the impact or influence of academic book on university students is more than the impact of journal article.
I am not sure whether my thinking is right to you. What do you think? Which one has more impact and influence on university students or on you as an academician? Academic book or journal article?