Your type of loss can have an impact on your brand choice. With @bluejay, she has fairly flat severe loss. Some find that even with aids they don’t get anywhere close to perfect results. An added auditory disorder can impact results.
She and I have a lot of problems with noise. An aid that allows more noise is problematic. She found that and chose the right aid for her.
Another may have a lot of problem with soft voices and choose based on that. The list of needs vary.
These tend to be things that the audiogram doesn’t answer. WRS, additional test and the interview process are tools used by best practice fitter. Those who do this are are who to seek. There are a lot out there who aren’t. If you don’t have a well qualified fitter, brand means nothing.