Hamsaterpowers mention of cold feet warrants more thought , The shower base will become a chiller of sorts good , cold feet in the summer is not much better then cold feet in the winter.
For fast conduction the copper pipe is superior (good for the drain undertaking)
but in the Solar heat collectors where the heat is constant the test performed by the author in the linked pdf file showed little too no difference in the heat exchanges properties or gains by the various plastic pipes as compared to the copper.
Pex should not be underestimated for use in other hot water designs as it in most cases is just as good as the copper in dissipating heat (the linked test denote that) and may be required by your insurance company or local bylaws. I believe that for New constructions or on Newer built houses not the older houses that have the copper pipe already..
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