There are different kinds of hearing loss, so it may be that no one hearing aid is going to be best for everyone. My dh has a huge problem making out voices when there is background noise, due to a job accident years ago. He has held off on getting hearing aids because in the past most of them don't do much for the kind of problem he has. However, I read about some new technology that is being developed for hospital patients. Apparently many of them do not get good sleep quality because hospital rooms are very noisy -- lots of equipment beeping, nurses coming and going, etc. The hearing aid being developed is one that would allow voices to come through but would deaden other sounds -- exactly what my husband needs. This hearing aid would allow filtering of sounds as well as fine-tuning. It's not on the market yet, but I will see if I can link the article.
Well, I couldn't find the article I read a couple of months ago. However, I did find this one that lists three types of hearing aid that can filter out background noise:
http://phb.secondsensehearing.com/co...ckground-noise
This might be useful as a starting point for research:
https://www.hearingtracker.com/blog/...rands-in-2017/
In my husband's case, he wants to wait until the technology improves for his kind of problem.