The Apprentice line is their cheap hobby line , the Artisan line is their better line . The main difference is the quality of the platings . The quality of any of the cheaper kit platings are not very good when it comes to a durable , lasting finish . The higher end kits use platings like Ti Gold and Rhodium which will hold up much better under normal use . Some of the hobby kits also use cheaper components and the fit and finish is hit and miss .
If you are making pens as a hobby and are not planning on selling them , any of the kits will work , But if you care about your craftsmanship and want to give a pen that will last or you are planning on selling them I would advise you to use the higher quality kits . Remember a pen that the plating wears off of quickly will reflect poorly on your craftsmanship , even though you made the best pens you could .