Define "Better".... The ones with the cams are much simpler to use and have very consistent results. The professional adjustable ones (Famous etc) are higher quality and more variable but harder to get "just right". I purchased a industrial machine and it came with three of the famous ones, all set differently, all worked great. For the pro's it was easier to have a machine set up for each separate task, or at least a buttonholer set for each size they used.