While both are workable solutions for repipe projects, there are many unique advantages that PEX pipe offers that cannot be found with copper.
The most common reason why people generally choose PEX piping over copper is that there is less of a risk for leaks with PEX piping. PEX also does not degrade as copper does and it is able to handle water at freezing temperatures more so than copper. It is also more cost-effective as it requires less time and labor to install.