I don't think this word has been used correctly once on the entire forum.
vir·tu·os·i·ty ( P ) Pronunciation Key (vûrch-s-t)
n. pl. vir·tu·os·i·ties
The technical skill, fluency, or style exhibited by a virtuoso or a composition.
Therefore, saying piece a is more virtuosic than piece b is clearly incorrect. They are a different type of virtuosity. I don't want to single people out, but Hmoll just said in another thread "they tend to want to hear the virtuosic etudes, so stay away from Op. 10#3, 6, 9, and Op. 25# 1, 2, 7, 12 ". True, these are virtuosic, but so are the other etudes, just in different ways,
Ed