nomen's right, those two bindings are like apples and oranges.  The benefit of the deadbolt is there is now lateral wing adjustment, like there is on the Salomon - this is the screw that always needs to be tightened or re-applications of lock-tight.  It also has the double srping in the breakarm, which is something 4FRNT and VIST have developed together - this is a solid jib-specific benefit.  The tendency of the break arm is to want to move downward on switch landings, and with most bindings, there is only one srping which pulls the breakarm downward - the one which engages when you step out of your binding.  The double spring in the deadbolt acts to keep the break arms from moving down when you land switch, keeping you from eating shit when your break arms don't have enough pressure keeping them from hitting the snow.
I love the deadbolts, but I think that the Salomon is a fine binding too... Salomon has been around for a long time and they make a quality product, but 4FRNT is amking an awesome binding now too, and for the price, it's a no-brainer... all dead bolts (412, 614, and 816) retail for $270 before any discounting - being able to buy an 816 for that is a sick deal