What's the difference between a steel kamado and a ceramic kamado?

According to amazingribs.com and community threads, ceramic kamados (like the Kamado Joe line) hold heat exceptionally well but are very heavy and can crack, while Weber's steel Summit Kamado uses double-walled insulation to deliver similar heat retention at lower weight and, reviewers note, a lower price than comparably sized ceramic models. Both can sear hot and smoke for 8-12 hours on a single charcoal load.