Freezer-based ice makers are generally more reliable and easier to fix, but in-door units save a considerable amount of space. Freezer ice makers can often be replaced by third-party units, while in-door units are generally proprietary products.
Despite being relatively easy to understand, ice makers are infamous for malfunctioning and are often the cause of repair calls for refrigerators and freezers. However, the open nature of freezer models means that homeowners can often inspect the unit and fix small problems. In-door units take up less space, which provides extra convenience over freezer models, but inspections and repairs generally require opening up the unit and inspecting a small space, which can be difficult for the inexperienced.