The answer to 'which is better duct cleaning or' is that duct cleaning can provide some benefits, but it is not always necessary. Duct cleaning can help remove dust, dirt, and other debris from your home's ductwork, which may improve indoor air quality and the efficiency of your HVAC system. However, duct cleaning is not required on a regular basis for most homes, and it can be expensive.
In many cases, simply changing your HVAC air filters regularly is sufficient to maintain good indoor air quality. Duct cleaning may be recommended if you have visible mold growth, pests, or significant debris buildup in your ductwork. But for most homes, it's often better to focus on other HVAC maintenance tasks like filter changes, thermostat calibration, and professional tune-ups.