[maxnoe]

Epub is just html with css and images in a zip file. So the quality of the typography will largely depend on the renderer, not the file itself.

[fau]

Unfortunately, the renderer that gets used will sometimes itself depend on the file. For example, if you transfer the generated Mobi file to a Kindle as the article says, it will get rendered using an inferior renderer (in terms of kerning, for example) compared to the renderer that would've been used had the file been a KFX ("Kindle Format 10").

[dhruvdh]

The end result would largely depend on the quality of generated HTML and CSS, no? That's what the OP is most likely asking about.

[masklinn]

The result is always an epub/mobi so the source doesn’t really matter.