EDC is suspension setting, where as MDM is traction control related.
I find the normal TC on the M3 quite good, surprisingly! My 335i is to be a super nanny even when dry off the line. Use to cut the power like mad, like hitting a tree.
But time and time again I tried flooring the M3 on normal TC on and it flashes but definitely surges forward and out of bends.
But MDM is really safe and fast. Can really feel it tugging the rear back in when you try and floor it. Relatively fast and safe. Thumbs up!
Must admit, haven't dared to completely switch it off in mine but, but have done with the 335i.