DPOS makes the blockchain a lot more like a company than the wild west free-for-all of mining/forging that PoW/PoS entails. Block producers are not determined by the stake they own, they're determined by their reputation and trustworthiness in the community, and what they can offer in return for their block production (development, marketing, etc.). Like a mix between NXT and ripple if ripple labs was decentralized and run on the blockchain.
DPOS and Nxt are two variations of PoS. The D in DPoS is a similar idea to the Economic Clusters in Nxt but different in implementation.