you should pick your medium based on how easy it is for you to produce on a consistent basis. for some that's writing. for others, it's an audio recording. maybe video.
if your goal is to share your work on a regular basis, then it is less important what your audience wants/likes because if it is difficult for you to produce in that medium on a regular basis, then you won't be getting the work out.
plus there are a ton of tools to change one form into another. text to speech, speech to text.
looking forward to what you'll be doing!