Choosing a grinder is about consistency of grind, aesthetics and service life of the burrs.
If you want the best grinder and can afford the MM, go for it. A common woe for many of the people on this board is upgraditis. If you buy the MDF you get a competent grinder but possibly a feeling you could have done better if you dont get the results you are targetting. Buy the MM and you will have to look somewhere else for solutions. You could also consider the Rancilio Rocky in this comparison. A very good grinder but the AB comparos place the MM as the better machine.