An important consideration is how the hearing aid will look. There's a number of styles to choose from. The best solution will depend on you hearing requirements.
Some people may do well with any style of hearing aid, but there are some performance issues to consider. There's a limit to the amount of power available from hearing aids that fit inside your ear.
Do want to go for a smaller size or more power?
For example, the more power required, the more likely that an 'In the Ear' hearing aid will feed back, or whistle in your ear. This problem can be remedied, but only with a perfect fitting in the canal. And for some, this type of hearing aid may be impossible to achieve if the size or shape of their ear canal is exceptional.
There are four basic types of hearing aids. Each type offers different advantages, depending on its design, levels of amplification, and size. Before purchasing any hearing aid, ask whether it has a warranty that will allow you to try it out. Most manufacturers allow a 30- to 60-day trial period during which aids can be returned for a refund.