It took me even longer to write them down than for you to say them. If my memory and math are correct, a good touch typist can key at about 90 words per minute, or somewhat less than 100 hertz. Analog telephone lines carry human speech adequately with a bandwidth of 2 kilohertz. Healthy young human ears have a bandwidth of about 20 kilohertz. I can make a case that the raw bandwidth of the human eye is many megahertz.
Oral communication is quicker and more spontaneous.
It can provide immediate feedback from the audience and is good for quick, broad strokes. Written communication is better for precise reasoning, for careful review, and for fine detail. It is better suited to wide distribution. Since it is inherently more permanent, it works well for the memory impaired. Finally, a somewhat facetious case can be made that the tools needed for oral communication are first the mouth, secondly the ears, and lastly the mind, but that the tools for written communication are first the mind, then the eyes, and lastly the hands.