In my possession are both the Radius and the SM3. The latter is the smoother (slightly), more laid back, earphone. The former is one of the most dynamic listening experiences I've had in my life. If the DDM had the same hell yeah! fit the SM3 has, I'd be hard pressed to use any other earphone. The SM3 may be a best of in the BA kingdom, but compared to great dynamics like the DDM, it is up against a lot! That isn't to say that I really really prefer one to the other, but the mid and low range resolution and texture is unbeaten by anything (am I saying too much?). Both are great and both stand at the top of their fields, but which is for you is the question.
If you've shied away from dynamics till now because of unbearable bass, the DDM will probably work for you since they aren't too boomy. But I understand if the opposite is true.
What earphone is the "DDM"??