Much-improved interior; seating space; versatility and toughness; towing ability; comfortable, refined ride; relatively fuel-efficient engines. The Suburban and Tahoe are by far the best-selling models in their class, and they're tough rivals for the Ford Expedition, Toyota Sequoia and Nissan Armada, among others. These two Chevy models are closely related in most ways--although there's a key difference: the Suburban is 14 inches longer in wheelbase and 20 inches longer overall than the Tahoe; and that results in a significantly larger third-row seat than in the Tahoe--as well as easier access to it, and more cargo space. Compared to rival models, the Chevy Tahoe and Suburban stand out for their ride quality and relatively efficient engines. They're also very rugged and versatile, and can be outfitted for off-road toughness, tow ability and interior luxury as needed. Chevrolet claims that the Suburban will be the most fuel-efficient model in the full-size SUV class, thanks to tech such as direct injection and active fuel management (cylinder deactivation). Although the profile of the Suburban and Tahoe haven't changed all that much, Chevy has managed to make significant improvements to aerodynamics. Chiseled sheet metal and big, flamboyant wheels (up to 22 inches) help maintain a powerful look.