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Q1: Should Kai or Ming be used as the default export font for Chinese?
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I'm far from being an expert here, but my opinion is that the Kai
variant, with it's handwritten look, is better suited for printed
material. Still, PDFs are also used on screen, be that a large
computer monitor or a handheld device, and on screen the legibility of
the Ming variant is better. One option that I like is to use Kai for
normal text and Ming for tt/code elements, as a kind of monospace.
As a Chinese, I strongly recommend *song* , the most poluar font, and we
seldom use ming in official documents...
I got the impression that there isn't a clear distinction between Ming
and Song, and some refer to the same thing with both terms. Looking at
the list of CJK fonts
none of the fonts that have Song in their name are under an open
source friendly license, so they can't be redistributed. Please take a
look at the sample PDF and see if it is acceptably similar to Song: