Timeliness : The chief advantage that magazines have over books is time. Information comes out more quickly in periodicals than it can in books. Often times, an article that will eventually appear in book form, originally appears in an article in a magazine or journal. Some disciplines, especially the science and technology fields such as engineering, rely very heavily on periodicals for the latest developments in their rapidly changing fields.
Original sources : Results of original research are often printed in periodicals first. Reviews of new books, works of art and performances often only appear in periodicals. Often the information contained in a periodical article will never appear elsewhere, either in a book or other work.
Ease of use : Periodicals can often provide good summary information on a field. For a short research paper, information from articles may be easier to manage than a lengthy book. Consider how in-depth you want your information to be.
Outdated information : Research results published in periodicals is often quickly disproved by more current research . Depending on what your topic is, you may want to make sure that the information you have is indeed the latest report. A book may be a better format in that several studies may be compared at once and indicate the progression of different experiments or studies and may indicate a more complete picture.
Incorrect information : Because of the pressure of deadlines with periodicals, information is not always checked as thoroughly as it is in books. This problem will vary, depending on the review policy of a particular publication.
Lack of context : Even if you are only interested in one section of a larger work on a topic, having the context of the larger work can help in the understanding of the one section.