Nowadays, the choice of media which we can get information is abundant andvarious.
.... I suggest the word "divers" in place of "various"
In this article I will pick three of them ---books, radios, TVs--- to analysis the advantages and disadvantages of them.
.... I find "in this article" is inappropriate. What you are given with is a prompt or a question.
I wish to contrast three types of media such as books, radios and TV in terms of their advantages and disadvantages.The three media change the way we get information totally and be regarded as the mainstream of media.
.... this is a bit confusing. You better re-write this sentence.