PEX tubing is generally a much better solution than copper for most, if not all, plumbing systems. PEX tubing is more resistant to failing or breaking as a result of freezing temperatures, and PEX is cheaper because it takes less labor to install. One of the few downsides to PEX tubing is that it is much more susceptible to damage from rodents. So if your application is in an area known to have rodent issues, we wouldn’t recommend PEX in that situation.