I didn't fly the Do but I reckon it has higher operational speeds. They're both STOL if I'm not mistaken, but maybe the lower speeds and the higher lift characteristics of the Otter can make for a gust or something to shake it off its path easier?
Though as a pilot you should be able to handle it with proper landing technique. As the ancient geek puts it, no greasers for starters. Using the props in an effective manner is also helpful as it helps to control the "airborne-mind" of the Otter at touchdown when it's carrying a couple extra knots...