Actually, cavity refers to the metal that is used to make the internal parts of the microwave oven. While both the cavities are good. But some important points make it different. Interior Part of OvenStainless Steel CavityVSCeramic Enamel CavityDurabilityless durableVSmore DurableStaining CoverStains can be seen after some timeVSNo strain can be even seen within 10 yearsCleaningBit harder to cleanVSEasy to clean