How is graphene different from ceramic coatings?
Quick answer: Most "graphene" coatings are ceramics reinforced with graphene -- often graphene oxide. Both bond at the nanoscale and protect the finish; graphene adds flexibility, slickness and thermal stability, which can help resist micro-marring and extend life. Results depend on product quality and preparation.
Graphene and ceramic coatings are both nanotechnology designed to bond at a molecular level with the clear coat. Both create an ultra-thin, hard, invisible layer that improves gloss, makes washing easier and protects against UV, chemicals and weathering. The differences come from the materials and the properties they bring.
Traditional ceramics are based on silicon dioxide (SiO2), which cures into a cross-linked, glass-like network. It is tough, chemically resistant and proven over years of real-world use. Graphene is a single layer of carbon atoms in a honeycomb lattice; in coatings it usually appears as graphene oxide or a derivative, integrated into the matrix alongside SiO2. The result is a hybrid that pairs the hardness of ceramics with the properties of graphene -- specifically a small amount of flex (graphene sheets are strong yet elastic, so they bend at the atomic level rather than crack) and good thermal conduction (which helps dissipate hot spots).
So the real choice on the shelf isn't "ceramic or graphene" -- it's straight ceramic versus ceramic reinforced with graphene. How much difference the graphene additive actually makes on the car depends on the specific product, the quality of the preparation, and how the car is washed and stored afterwards. Ceramics are tried and tested; graphene is the newer addition with promising enhancements. Both outperform traditional waxes and sealants.
For the broader question of whether graphene's extra cost is worth it for your car, see is graphene worth the extra cost over ceramic? -- it covers durability, scratch resistance and value in one place.