The novel Angels & Demons was published in 2000 and followed only in 2003 by the mega-bestselling sequel The Da Vinci Code. But the order was reversed for the film adaptations: the film of The Da Vinci Code was released in 2006 and the film of Angels & Demons only in 2009. Bearing this in mind, what is the best order in which to watch the Robert Langdon film series?
Does Angels & Demons count as a prequel (I assume that, as is the case for the books, it's set before The Da Vinci Code)? Would it make sense to watch this one first, i.e. watch them in the order intended by the original author Dan Brown - or is it more advisable to watch them in release order?
(I assume that Inferno should be watched last, given that both the book and the film were released after the other two. Thus I've focused only on the first two films here; but if there's any good reason to watch Inferno before one or both of the previous films, then I'd also be interested in that.)
Please give answers which include reasoning based on the material of the films, and not just personal opinion.