Bagged: I would say the Sebo Felix, Riccar Radiance, Miele S7, and maybe the metal Royals.
Bagless: Dyson leads by a mile in terms of appearance. Their newer products are Apple-esque in their modern beauty, and their aesthetic remains what other manufacturers vie to achieve. Whether or not the products have shortcomings, the lure of the design drives the industry, and ample sales!