Prefer all the to all of the when preceding a noun in all written English. The former construction is more succinct and places emphasis on all or the noun, both of which carry stronger meaning than of, which steals the emphatic burden in the latter construction. Reserve all of the for preceding a subjective pronoun or a possessive proper noun (where the phrase drops the the). Thus All the members are here, All of us want to eat, All my siblings are angry, All that jazz, and All of John’s plans have gone to naught.