+1
The DC amps are more chewy and towards the recto tone, much more open sounding. The Mark III is more tight, compressed, and focused. The same can be said about the cleans; the Marks cleans are very tight and Fendery, and the DC's are a little more warm but still awesome. +1 on the balancing act you have to do balance volume and tone on the Mark III, the DC has seperate controls. OD pedals, tube/speaker choice and careful EQ'ing can bring the DC's into either recto or Mark territory though - i've played and heard it many times.