In order for the putter head to move squarely along the proper arcing path, the toe of thte putter must “flow” throughout the stroke (see the Path illustration). How and where the neck or shaft of the putter joins the head determines its toe flow.
If your stroke does not track along the proper arcing path,
choose a putter that helps correct it. If your stroke flows naturally, choose a putter that flows with it. This will reduce the tendency to manipulate the putter face with your hands. The best way to find the toe flow that corrects or compliments your stroke is to hit straight, flat putts from 20ft to see what works best.