Depends on your usage, it’s all about the features! The ProLam 160 is a 4″ unit, which is great for laminating small cards only; the ProLam 330 is our most popular unit as it is affordable and has a 13″ throat opening to accommodate an ID card size up to 12″ x 18″ size; the ProLam Photo is perfect for professional use in laminating photos and other hard-to-laminate materials. It has an auto-memory function and energy saving stand-by mode; The ProLam Ultra is a favorite for commercial use with it’s 7 memory settings that ensure the correct temperature and speed for different pouch thickness. This superior unit features an air cooling system and auto shutoff. All units are designed for crystal-clear and bubble-free lamination and one year warranty.