The answer to 'which is better septic system or sewer system' is that there are pros and cons to both options, and the best choice depends on your specific situation and location. Septic systems are self-contained wastewater treatment systems located on the property, while sewer systems connect to a centralized municipal sewage treatment plant.
Septic systems are generally better suited for rural or suburban areas without access to a municipal sewer. They can be more cost-effective to install and operate, but require regular maintenance and pumping. Sewer systems are more common in urban and suburban areas, and often offer the convenience of not needing to maintain a septic tank, but may have higher ongoing fees from the municipality.