Am not a big player in the world of Hubbing, but some topics have been better than others.
My dog training Hubs have faired poorly except for one, which I find odd because I consider them some of my best, most competent writings. My stuff about children doesn't do well, either.
Did one one describing what theft was and it still does well. Did one biography and that faired well. Did one about tattoos and that has by far the most hits.
None of them started extended conversations.