The answer is both. The different formats appeal to different people. So if you love FB live go for it. When you are done save the video. Strip the audio, make a few relevant edits ( you don’t need the parts where FB live crashed for a minute or where you explained for the 4th time that you will answer questions at the end). If you are careful with your recording quality for the video the audio should be fine for you to use for a podcast. If it needs some tweaking send it to an editor.
Now you have satisfied your audio learners and your visual learners.