With both of them, I think their lack of breakaway speed and pure elusiveness leads to the fans calling these guys "power backs". However, I think they both are a little short on the actual power they demonstrate to be top power backs.
I'd call them both 'tweeners. They have some of everything you'd want in a back, but neither have all of what you'd want in a back. The closest "all" trait would be Ducre's effort on every play -- which is a huge trait to have.
I go with Ducre for that consistency. Then, I'd place huge pressure on Dixon to come every week with the goal of getting his starting gig back.