There is a lot to be said for aluminium as a material for building yachts:
Aluminium is a lightweight material. It weighs three times less than steel. This means that the hull may weigh up to 50% less compared to steel. A lighter hull offers better performance, a shallow draught, lower fuel consumption, less capital outlay for engine and propulsion systems.
Aluminium guarantees a stiff and strong ship. Although it has a slightly lower tensile strength, the strength vs weight ratio of aluminium is equivalent to that of steel. There is much less risk of a hole in the hull in the case of a collision, than with a fibreglass hull. This makes aluminium yachts safer yachts, especially when at sea, when distances to reach the shore and emergency assistance are often vast.