The answer to 'best water line' is that the best water line for a home depends on several factors, including the age and material of the existing plumbing, the water pressure and flow requirements, and the local building codes and regulations. Generally, copper, PEX (cross-linked polyethylene), or CPVC (chlorinated polyvinyl chloride) are considered the best options for residential water lines.
Copper pipes are durable, corrosion-resistant, and have a long lifespan, but they can be more expensive to install. PEX is a flexible, cost-effective option that is easy to work with and resistant to freezing, while CPVC is a good choice for areas with hard water or high mineral content. The best water line material for your home will depend on your specific needs and budget.