The answer to 'which is better aluminum wiring or copper wiring' is that copper wiring is generally considered better than aluminum wiring for residential electrical systems. Copper is a more reliable and durable conductor that can better handle the electrical loads in homes. Copper wiring is less prone to issues like corrosion, overheating, and connections becoming loose over time.
While aluminum wiring was commonly used in homes built in the 1960s-70s, it has since fallen out of favor due to the increased risk of electrical fires and safety hazards. Copper is the preferred choice for new home construction and electrical upgrades.