Ahh, Ernie Gann and the ice with Hughen in the -2. A great read.
Other than the usual generalizations regarding wing loading, airfoil camber and thickness ratio, I wouldn't have anything to offer regarding a comparison of icing behavior between the DC-2 and the DC-3.
And in 2011 it is still a great lesson in the value of learning from the senior guys, notwithstanding modern CRM.
Not everything is covered by the pilot puppy mill's curriculum.
"The gigantic Dunn was good-natured enough, but he had a strange facility for making me feel unsure... Yet I learned a great deal from Dunn.
He was always wary."