To me, the difference is about the approach to sound ,gear and way of music you would like to play.
Dynaudio is more direct and clean which could be good for different types of music replay provided that you have the room.
MBL is good at 360 for easy enjoyment of music. Although I never try audition MBL speakers except AV show, I found that MBL also requires very high requirment for driving their speakers especially a set of same brand MBL is prefererd.