I have watched both for a long time - QVC since its inception. I used to watch HSN more than I do now, but have found that the things they show now for the most part don't interest me. I did buy a lot of jewelry a few years ago, Jay King, Chaco Canyon southwest jewelry, Technibond occasionally, but I really have all I need. I did get some beautiful sterling silver/gemstone rings. Also used to buy DG2 a lot and always watched her shows, but her quality and fit has gone downhill so much that I refuse to even watch any more.
They used to have a brand called City Hearts, athletic/leisure clothing--I have two hooded jacket/top/pants outfits that I absolutely love, wish I had gotten the third color. But as it seems with all good things, they replace them with something not as nice. They are now doing a lot of "AS SEEN ON TV" - what's with that? It's just stuff from a lot of TV infomercials. So I mainly watch QVC, HSN once in a while.
One more thing, I did finally break down and buy Joy Mangano's Huggable Hangers, 3 of the big sets, had so much trouble with wrong color, accessories not the same color as hangers, unusable over-door hooks, etc., it really turned me off. So will not watch her either.