Since you already liked the second post…
…I suppose I can share a little preview…
…but then you need the book’s disclaimer. The information is “As-Is” and at your own risk.
Audio / Video formats may involve patents. I’m not a lawyer.
TL;DR — I personally use M4A / ACC. The compatibility is great. It seems to be less of a patent / technical headache than in the past. (Again, I’m not a lawyer. I don’t even play one on tv.) https://caniuse.com/#feat=aac