The pecking order of quality:
text books/journal articles > books >> online articles.
I'll try to at least read 1 book per week, but on a good week I can get in up to 3. If the books are technical (i.e., programming) on a good week I can get 1 book read. If the books are mathematical (i.e., an algorithms textbook) I'm lucky if I can get 30-50 pages processed.
Audiobooks are the holy grail of passive consumption of content. They are so, so underrated.
IMO, the primary point of online articles is to get your finger on the pulse of what other people are up to. Other than that, they are similar to informational twinkies. Obviously there are exceptions: a Paul Graham article is certainly not an informational twinkie! But, by and large, reading something that somebody spent a year on (i.e., a book) tends to be a much better use of your time than reading something somebody spent 1-5 days on (i.e., an article).
Books go deep. Articles go broad. And textbooks are like "here is a broad summary of what the human race knows about a particular subject, at least up to about a decade or so ago."