Some (perhaps more then half?) of guitar players prefer to see D# G# and C#
I think most piano and horn players prefer Eb,Ab and Db because if you're used to reading anything in that key those keys have fewer accidentals.

I did an experiment using Ab Db Gb and Cb (I did both Cb and B)

When transposing to Eb for alto sax I ended up with F Bb D# and G# . The Gb and Cb did not help in giving me an Eb and Ab .

Interestingly when transposing the Cb and B were all corrected to be the same chord. Only in the original key of C did they show up as Cb and B (for alto I had to transpose to Eb)

Couldn't there be a way to (post transposition) have a function that you could allow you to favor flats or sharps ?

bobsax