Choosing the best vacuum cleaner depends on your specific needs. Bagless models have no recurring costs, while bagged models can help a vacuum last longer by keeping debris out of hard-to-clean parts, thus preventing clogs over time. According to air quality experts, bags are better for people with allergies or asthma because they are easier to dispose of without spilling debris or kicking up a plume of dust. However, bags will need to be replaced several times a year, and pet owners may find that they fill up faster, resulting in added costs.