I’ve got only good things to say about Dura-Ace. SRAM red seems to be an excellent set up too, except for the flimsy front derailleur. I just helped a friend ‘downgrade’ to a Force FD and he says that the shifting is much better with the Force FD.
If weight matters to you (for the weight weenie inside of us!), it would appear that the SRAM RED road groupset is over 200g (>1/2 a pound) lighter than Shimano DA 7900.
http://www.totalcycling.com/index.php/component-weights.html