The answer to 'air duct vs' is that air ducts and air vents serve different purposes in a home's HVAC system, and the choice between them depends on your specific needs and preferences. Air ducts are the enclosed channels that carry heated or cooled air from your furnace or air conditioner to the various rooms in your home. They are typically hidden behind walls and ceilings, and are responsible for distributing air evenly throughout the house. Air vents, on the other hand, are the visible openings in the walls or ceilings where the air comes out. They are the final point of contact between the HVAC system and the living space.
The main benefits of air ducts are that they help maintain consistent temperature and airflow throughout the home, and they are less visible than air vents. However, air ducts can be more expensive to install and maintain, and they can be more prone to dust and debris buildup. Air vents, on the other hand, are generally less expensive and easier to clean, but they may not provide as even a distribution of air as air ducts.