Pens have always been a hot topic in shorthand circles.
I myself have maintained (on the basis of evidence I might add) that pen choice can make a 10wpm difference to note-taking speed.
That said, the “best pen” is clearly an issue of personal choice.
Some might prefer a pilot graphic pen, others a pencil, others a fountain pen with or without a specialist nib.
I’ve seen reporters using standard ballpoints (because that’s what their employers offer), nylon nibbed pens, gel pens and so on.
I’m really interested to find out what we, as a shorthand community, choose to write with. I did have a poll set up but it doesn’t seem to work.