Avoid Kinks at Tight Corners - Plumbing With PEX Tubing PEX tubing is an easy-to-install alternative to copper pipe. Long used in radiant heating systems, flexible PEX tubing is perfect for water supply lines because it’s easy to run through walls and floors and simple to work with. Read more: http://www.familyhandyman.com/plumbing/plumbing-with-pex-tubing
Both PEX and copper are good options; however, both have some advantages and disadvantages as well. PEX is less expensive, and fast to install, while copper is more expensive and can burst in cold weather.