I am considering specifying seamless-edge doors and trying to decide which design I should specify: vertical seam edge filled, dressed smooth, intermittently welded seams, edge filled and dressed smooth, or continuously welded seam, dressed smooth? How do the three options differ?

Seamless edge doors are specified primarily for aesthetic considerations. Edge-filled and dressed smooth doors are treated with a filler material and subsequently sanded smooth and painted. Intermittently welded seam doors, are welded at intervals along the seam, treated with a filler material and subsequently sanded smooth and painted. Continuously welded seam doors provide an uninterrupted weld the entire height of the door edge with no added filler material and subsequently sanded smooth and painted.