The answer to 'which is better sewer line or' is that sewer lines are generally better than septic systems for most homes. Sewer lines connect your home's plumbing directly to the municipal sewage system, which is a more reliable and environmentally-friendly option than a private septic system. Sewer lines require less maintenance, don't need a septic tank or drain field, and are better suited for urban and suburban areas with access to a centralized sewer system.
However, septic systems can be a good choice for homes in more rural areas without access to municipal sewer services. Septic systems process wastewater on-site, making them a self-contained solution that may be more cost-effective in some cases. The tradeoff is that septic systems require regular maintenance and inspections to ensure they are functioning properly.