The SAT is being revised and it will be slightly more ACT like. Last year, it was the first time students taking ACT more than those taking SAT. The main reason is because of the mandated ACT tests in more than a handful of states. SAT obviously needs to compete in this market to reverse the trend. I am not surprised that they will cut their arms to get the first few contracts particularly during their transition to the new format. You know the uncertainty and lack of preparation material may drive the students away initially. So this move may be a good move for CB and Michigan.
As for the students, I think it has a slight advantage too. First, they will take PSAT anyway so they would be at least aware of the format of SAT. It may be less confusing if they focus in one test format (e.g. to guess or not to guess). Second, retaking SAT would be more cost efficient than retaking ACT as many schools do superscoring SAT and there is no extra cost to have multiple test scores reported.
For students who will be taking both tests, it does not make any difference and I do recommend that as one may do better in one test than the other.
I don’t think there is any difficulty added to the adcom as they have been dealing with both scores all the time.
Note that there are awards and scholarships based on MME results.