What is the contrast between dinka and nuer?

By contrast the Dinka and the Nuer spearhead another (non-Equatorian) segment of the social and cultural composition of South Sudan commonly known as the Nilotic ethnic groups. But there are also Nilotics in Equatoria, such as the Acholi community. The dominant cultural feature of the Nilotics is their mobility and cattle-keeping, though some also till the ground and grow crops. However, the Dinka and the Nuer are known for seasonal migration straddling vast space of land mainly in search of pasture and drinking water for their cattle. Because cattle play a central cultural role in the Dinka and Nuer communities, they are popularly known to be adept at keeping and maintaining cattle.

Ido have a poem that i wrote in my english class if you would like it.