Originally Posted by mmat1
0.7, 0.75 or 0.8; this doesn't make much difference, it's just a matter of personal taste.
It's rather a matter of the font used (which is a matter of personal taste, if the device allows it). The height of smallcaps should be the same as the height of lowercase letters, and the ratio lowercase/uppercase varies from font to font. Nevertheless some fonts (like the Kp-fonts
package, for LaTeX) provide at least two smallcap sizes, so I guess there's still some personal taste involved after all.