I found an article in the web magazine from Sony "CX-news" as PDF and as website. It is not exactly an article (it has no clear author, but the name of the magazine and the volume number) and its not just a unspecific webpage. How should in such an "in-between case" the citation look like and what information to put where in the bibtex file? The PDF contains more information and is thus probably better to cite.
How the citation should look depends on the style you are using.
In your case I would use
The kind of entry depends on your style (what does it offer?). Possible could be
I would prefer to cite the pdf file because I can download it for later consultation/reading. A webpage can vanish. And if the pdf contains all the important information in an compact form, I would prefer it.