I'm definitely a visual thinker, but I understand there are a lot of things that are better expressed in text. I do mean text, though, audio does nothing for me. My reading comprehension is easily 5x better than my listening comprehension, not to mention being about 1.5x-2x faster than a reasonably quick presenter.
The thing about pictures is they can immediately deliver an entire essay's worth of precise information. For example, write out all the data conveyed by a simple line graph of something like the last 3 months of some global market, then compare how long it takes to assimilate the information in each.