I am non readable on the net bite of the sentence, "which one is the best". I mentation it is standardized to the article in "I am going to cover what they are", the society of objective and the verb is converse (I forgot what the grammatic terminus is), "which one is the best" should or else be something like "which one the best is". The return is I intellection that with the summit make of an adverb we should apply the clause "the" ("the most" or "the best", e.g.). To that degree as meaning ...