Lived in ND most of my life. Born here, have farmland here, & have home in Bismarck. Great place to live but the winter's are tearing me up body wise.
SD has the Black Hills and there are many wonderful sites to see and lots to do. Great trail riding if on a bike, motorcycle, atv, or side by side. Also the scenery is nice to enjoy on a bike, motorcycle, car, or anything on wheels. Have met many wonderful people in SD whether from there or from another state. Most people are really friendly and have visited with many ranchers around the Black Hills while out in our Polaris side by side. Sd winter's are usually more mild than ND.
SD doesn't have State income tax.
Both states are pretty friendly but i lean to ND just for the fact of being from here.