The best replacement for pex is copper.

The best alternatives to pex are rated as following:
★★★★★  copper
★★★★  cpvc
★★★★  pvc
★★  copper plumbing
★  polybutylene
★  copper piping
★  copper pipe
★  sharkbite
★  wirsbo
★  hdpe
★  groupmanager
  group manager
  copper heat transfer
  kitec
  cpvc pipe
  cpvc cost
  pb pipe
  copper pipes
  pvc plumbing
  copper water lines
  pvc pipe
  copper tubing
  pb
  copper which is better
  copper flow rate
  ipex
  copper cheaper
  pvc piping
  pert
  copper plumber
  3 4 pex

Your alternative for pex is not listed? Suggest!
Speaking about pex, one probably shouldn't forget about copper.

Other search terms related to pex and their ratings are:
★★★★★ copper
★★★★ sharkbite fittings
★★★★ heat tape
★★★ essentials chat
★★★ baseboard heating
★★ compression fittings
★★ manifold
★★ hose clamps
★ cast iron radiators
★ baseboard heat
★ baseboard heaters
You have in mind a companion for pex and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pex in all years. Click on graph for more.
pex
copper
cpvc