Could I interest you in a Rotring 600? Keep in mind I haven't used either of those you listed.
review: https://www.penaddict.com/blog/2012/3/5/rotring-600-drafting...
jet pens: https://www.jetpens.com/Rotring-600-Drafting-Pencils/ct/1109
review: https://www.penaddict.com/blog/2012/3/5/rotring-600-drafting...
jet pens: https://www.jetpens.com/Rotring-600-Drafting-Pencils/ct/1109