Research articles, in my opinion, are optimal for higher grade students (masters and Ph.D.), especially with connections to some "cool" online material - animations, data in brief, interactive content etc. Books may be also useful, but they are not always up to a date.
Sure, the researchers (Master and PhD Candidates) can achieve the up to date trends and knowledge from the research article. This will support their research work and writing the articles.
The young researchers need to read the relevant text books for their thesis writing and more details in theoretical studies.
Mostly, the research articles are only analyzed in one portion of the research due to the page limits and its inherent writing.
Therefore, the young researchers can't know very deep from these.
Regarding my experience, some of the young researchers just read the three articles and then, they think it is enough reference. Then, their thinking are same as these articles and they lost their contributions.
Too much reading is not good.
Also, not reading is bad.
The young researchers should read the up to date text books.
I think that the young researchers, have first of all interest to consult the scientific articles in order to have idea on the new scientific in their fields!
A scientific article is a good guide (the experimental part) for the practical work of a researcher!
A book is a very solid support for a researcher, who will start writing his scientific article!
I think the research texts would be good for young researchers for understanding fundamental research concepts and then they can gravitate to the shorter journal articles that may not have as much details as the books. But despite the latter, novice researchers sometimes have specific questions as they get into research that can be better addressed by a mentor or a seasoned researcher. I have done some research targeting this need for graduate students that I hope can be helpful on shedding light on this issue:
Chapter Research e-Clinics: Reducing Lags in the Completion of Gradu...
Presentation The Early Career Faculty Networking Event: Research e-Clinics Review
I think that both research articles and books can trigger an effective reading for the young researchers, depending on their goal. Books are better sources than research articles, regarding accumulated and in-depth knowledge. Recent research articles show the current trends in scientific research. Nevertheless, both books and research articles are useful and important for the progressive development of young researchers, and not only.
Both are useful for young researchers. Having access to internet materials will be also beneficial on condition that researchers should avoid copy and paste of materials and know how to cite and document.
In general, novice researchers need to rely on and use books because they are the most accessible and wisest of counselors , who are ungrudgingly and patiently at their service all the time. Alternatively, articles related to the researchers' fields of study can be used as mentor texts providing them with useful models which help them follow the stylistic conventions characterizing text production. The reason is that style is standard conventions of writing portraying the distinct ways individuals combine words for expressing their ideas. On this basis, both books and articles have a great bearing on young researchers' professional development ; they are complementary not mutually exclusive.
Both books and academic articles are wonderful resources for young researchers. However, I would prefer articles over books as articles present the latest trends, findings, and discoveries in a specific filed of study.