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Without considering cost:
Q1): Is cold weather [ i.e. - freezing temps. ] a
regular occurrence or concern for you ?
Q2): Is any of the re-piping that you plan to
do on exterior walls or in your attic space ?
Q3): Are you going to do the work or hire it
done ?.......Pex is typically cheaper & faster to
install.
MY PREFERENCE:
I prefer to work with copper.......That is what
I learned years ago and have practiced with
the most.........Copper piping is less forgiving
as far as "expansion \ contraction" of the
piping, than pex........Regardless if the water
lines are located in exterior walls or attic spaces,
ALL of the piping should be thoroughly insulated.
If you do not have water shut off valves located
at various locations, you should give that some
serious consideration, for when you need to
isolate a leak.........Valves should be thoroughly
insulated too !
IMO, ...the choice of pex vs. copper will come
down to what you are most comfortable with.
For me, ...I prefer copper !
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