Well theres a number of differences between the DC and the MA...
1. Push button harness adjuster (which gives ALOT of people ALOT of problems, but it is also great for a houdini child that likes to play with their adjuster)
2. Adjustable Crotch Strap (it has 3 positions instead of just the 1 that the MA has, but I dont care for it much)
3. Infant Insert Pillows (these seem to help infants fit a little more snug, but it would compress in an accident anyway, it just a comfort issue)
All in all, I dont see much point in the DC, some parents love theirs, but I didnt like it personally. I have heard too many issues with that push button adjuster. I would push you towards the MA, I absolutely love mine. :thumbsup: