Voice synthesis takes getting used to, and it is much easier to deal with if you have to rely on it for a print-related disability. The voices on Voice Dream Reader, such as Sharon or Heather, are excellent compared to the stock voices on iOS/Android.

You may want to try getting a subscription to the digital databases at Houston Public Library (if you live outside the state of Texas, otherwise it is free) before shelling out money for an Audible subscription. For $20/6 months or $40/year, they have one of the best digital media databases in the country (there are also a few other libraries of similar caliber. You also get premium access (including the app) to Lynda.com for that price, in addition to a ton of audio books.