For most people, a Fine or Medium is a safe first Safari nib. Medium lays down a rounder, wetter line that feels smooth on the page and exhibits the ink’s color and shading, making it a solid everyday pick. Fine delivers a thinner, controlled line that suits smaller writing, while Extra Fine is the tightest of the three, ideal if you write quite small or want the driest, most precise line. Lamy nibs run about one size broader than Japanese pens like Pilot, Sailor, and
Platinum, so if you're used to a Japanese Fine, size down to a Lamy Extra Fine to get a comparable line. Save the broad or the stub calligraphy nib sizes for more decorative writing or if you commonly write on fountain pen-friendly paper.