I suppose that after 12 years, and a sizable portion of that as a trainer, I have a pretty good overview of the MA vs the DA argument.
First, I will state this. The better 1v1 pilots are often the better MA pilots. You run into a guy with top level plane handling and ACM skills, along with great SA and you will get owned. The best 1v1 pilots don't limit themselves to dueling in identical aircraft. It's far better to duel in dissimilar aircraft. This is the best way to learn how to fight anything while flying anything. The best place to do this type of dueling is not necessarily the DA. I believe that the TA is better, simply because you don't waste time re-planing. You just break off and re-merge for another go at it. Someone makes a mistake, and there's not 10 minutes wasted for the next fight (unless there's a auger).