For a one-off boat my first choice would be aluminum and my second choice would be cold-molded with epoxy construction. They are in the minority because they don't lend themselves to series production. But they are lighter and stronger than a conventional fiberglass boat. This is where fiberglass wins - one mold and they can pop out hundreds if not thousands affordably. As with any boat you find maintenance is more critical than hull material.
Living aboard in Victoria Harbour