I have both. Sold the switchman but have the dac 6e and a dcc 2. They are real close. I haven't spent alot of time comparing but running the dac 6e through the dcc 2 pre amp, seems to me to be a little warmer. HOWEVER, I'm adding another set of copper ic's and that could be the difference.
I was perfectly happy with the Dac 6e/switchman combo and went to the Dcc 2 only because of space and looks (wife factor) in my living room. And I only listen to 2 channel. If I were to have a 2 and multi channel combo system, then without question I would go the Dac 6e and switchman route.
If I have time this weekend to experiment further I'll report the results.