Your question is pretty broad so I'm not sure a concise answer can be provided. Can you narrow down the question further? If you were referring to the NetFlow Analyzer module for Orion NPM, its integration with Orion NPM would be one advantage over ManageEngine. You can clearly see this from their online demo.
You might be better served if you posed this question or had this thread moved to the NetFlow Traffic Analyzer forum. There is a running thread over there asking this very question: Re: Does NTA understand NBAR?