Dark Knight vs. Iron Man

If you ask Robert Downey, Jr, who seems to have an opinion on the matter:
He admits that DC Comics’ Dark Knight made him feel “dumb” and in need of a college education, likening the movie to a Ferrari engine.  Downey also alluded that there was too much going on in the plot.
His parting shot was (and I quote): “You know what? F**k DC comics. That’s all I have to say and that’s where I’m really coming from.”

Ironman Comic from the movie signed by Robert Downey, Jr.

Robert Downey, Jr. is Tony Stark in Marvel Comics' Iron Man

Heath Ledger portrays the Joker in DC Comics' Dark Knight

Have you an opinion on which is the better bit of entertainment?
Or do you think they’re both great movies, just different?
Go with the numbers (Dark Knight took approx. 155 mil its first weekend, and is the third highest-grossing domestic film of all time with $442 million in sales as it topped the movie chart for a fourth straight weekend, Iron Man raked in about 107 mil opening weekend…) or cast your vote:
Either of the above are available for purchase. 
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DC Comics at NW Limited…History in VogueTM
Marvel Comics at NW Limited…History in VogueTM
/Film – “Robert Downey, Jr. Disses the Dark Knight”
Robert Downey, Jr. talks Iron Man 2 article at Film School Rejects
Heath Ledger at IMDB