How to pick between UI and non-UI version of a font?

[GoogleCodeExporter]

This is more of a question than an issue. 

Noto fonts seem to come in 2 flavours, the fonts with UI in the same, and 
without.  Reading through the git log and previous issues, the one without UI 
in name seems to be referred to as "body font" or "document font".

When should I use one over the other? (If I had to guess, I'd say the non UI 
version is preferred because that the default at 
https://www.google.com/get/noto/#/) 

I did some investigation. Reading through the font I noted that the UI font has 
a slight differences in number of glyph, glyph outline, vertical metrics, may 
be more. Notably UI fonts have less yMax 2163 than the non UI font. So this 
could result in clipping after shaping a line with fixed height.

But this comes back to the original question, in what situation would someone 
use the non UI version of the font?

Original issue reported on code.google.com by crest...@gmail.com on 6 Jan 2015 at 11:19

[GoogleCodeExporter]

The UI fonts are indeed designed for situations where vertical space is limited 
and clipping will occur, like Android UI.  For documents, where there are no 
such limitations, the non-UI versions of the fonts are preferred.

Original comment by behdad@google.com on 7 Jan 2015 at 4:47

[GoogleCodeExporter]

Original comment by behdad@google.com on 7 Jan 2015 at 4:48

• Changed state: WAI