This makes me wonder if you have visited them. Brandeis is very different from the other two. ED at Brandeis is probably your strongest chance. BU took 50% of their admits from the ED pool last year so probably your next best bet. All 3 schools do have a noticeable ED advantage that is not, or not much, diluted by legacy and athletes as it is at some other schools. All 3 schools (I believe) have ED2 as well so you have a second ED option if the first doesn’t work out.
For ED you should be applying to a school that you love and have no doubt is a clear first choice.