For anyone who prefers mechanical pencils over pens (like myself), I have been extremely happy with the pairing of a Zebra M-701 and Uni Nano Dia HB 0.7mm on Leuchtturm1917 or Moleskine paper.
I personally prefer a heftier, thicker pencil as the skinnier ones make my hands cramp up a little after a lot of writing (something . I do have some drafting pencils from a different brand (nothing spectacular) but they're mostly relegated to my art supplies drawer.
review: https://www.penaddict.com/blog/2012/3/5/rotring-600-drafting...
jet pens: https://www.jetpens.com/Rotring-600-Drafting-Pencils/ct/1109