Plectra: quill or Delrin?

Traditionally, plectra are in quill, sometimes in leather. Nowadays, many makers and voicers use Delrin, a polyacetal. How to make a choice? The comments below might be useful.

Ten good reasons to voice in quill

1 - It sounds better.
2 - The touch is more responsive.
3 - The touch is lighter.
4 - Quill plectra will not let you down unexpectedly in the middle of a concert.
5 - Quill plectra are long lasting.
6 - Quill plectra are not difficult to cut and voice.
7 - Quill is a historical material.
8 - Few feathers are required.
9 - The strength of the pluck is adapted to the pitch of the note.
10 - It sounds so much better!