On the PEX front there are two different type of connectors from what I have seen. One uses the crimp ring and another type uses a tool to expand the PEX, insert the fitting and slide a tubular sleeve over the joint. Not sure which one is best.
I sure hope PEX gives better service than polybutylene did in the 80's and 90's. Talk about a disaster!!!
I did two short lines in our basement with polybutylene to get water to a wetbar. Really easy to install and lower cost than copper. It took just over 10 years and the fittings started leaking.  Yanked it out and did copper, not fun with a finished ceiling and drywall.
One thing about PEX, keep it out of sunlight, UV is a PEX killer.
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