I was close to pulling the trigger on an MDX, and ended up with the Ex Sport. From having the car for half a day, the ride was nice, and I didn't notice too much road noise, at least not much more than the Ex has.
Price-wise, the MDX would have been about 2k less than X-plan for the Ex, for a MY12 Tech/Entertainment Pkg with tow hitch. In the end, the interior felt dated, or to quote my wife, like an old persons car.
Try driving both a bit and see what feels more comfortable. I will say that IMO, the seats in the MDX have better lateral support, but I am very happy with our decision.