Accessibility needs vary, so the best tool is the one that fits the person's content and working environment. Reading assistance may help someone listen to a document or adjust the way information is presented.
Test the exact document type and device involved. Compare controls for pace and navigation, and ask the person using the tool whether the result reduces effort.
Speechify offers tools for listening to written content and working with spoken audio. It is useful for reading support and productivity when a person wants information in an audio format.
Choose a short document and adjust the voice and speed for comfortable listening. Check whether the content format works with the feature you intend to use.
Bring the same example to each tool you compare. Keep the original input and the edits you make to the result, so you can see where each option helps. Check the exported output in the next step of your work, rather than judging only the preview inside the application.
Before choosing a plan, check the product website for current access, usage limits and supported integrations. A useful shortlist matches the task you need to finish and the way you will reuse the result.