depends on your wants/needs/expectations. With torrents, you have upload back to the community, worry about ratio, etc. Things show up slightly faster on the better torrent sites before they show on newsgroups, but whats a few minutes anyway?
I find myself using newsgroups more and more, and just seeding some stuff back to torrent sites so that I can build a good ratio and download some of the older/non scene stuff that may not have many leechers. Scene stuff I just get from newsgroups, so I dont have to worry about ratio on big dvdr's and such.
So yea, its basically up to what your looking for..