The answer to 'best water line' is that the best water line for your home depends on several factors, including the age and material of your existing plumbing, the water pressure and flow needs in your home, and local building codes and regulations. In general, copper, PEX, or PVC pipes are considered the most durable and reliable options for residential water lines.
Copper pipes are a traditional and long-lasting choice, but can be more expensive to install. PEX (cross-linked polyethylene) pipes are becoming increasingly popular due to their flexibility, durability, and lower cost. PVC (polyvinyl chloride) pipes are also a cost-effective option, though they may not be suitable for all applications. It's important to consult with a licensed plumber to determine the best water line solution for your home.