A lot of the items on that table really aren't very self-explanatory (Derived image, for example, obviously has a clearly defined meaning in this context, and it appears to be contrary to what I expect it to be). They assume a background that I don't have, and at the moment I don't feel that I have the time to spend obtaining it. I was asking for more of a layperson's comparison of the differences. Read it as "Why should I prefer HEVC over PNG, when they appear to be mostly identical".