The Shark Vertex UltraLight Corded and Shark Vertex Lightweight Cordless have different advantages, and either may suit you better depending on your needs. The UltraLight Corded has an effectively unlimited runtime courtesy of its corded design, comes with a turbo brush, and performs better on both low and high-pile carpet. Meanwhile, the Lightweight Cordless has an effectively unlimited range, an allergen-trapping HEPA filter, superior maneuverability, and better performance on bare floors.