The cabins are the only moderate that offers any sort of bonus of being close to MK (boat). Other than that, you won't notice a difference in transportation time. Taking a bus might be 5 minutes faster between resorts, but you might end up waiting 10-15 minutes to get onto a bus that day, luck of the draw. We have stayed CSR and thought they had good bus service.
Just pick the moderate themeing that most appeals to you.