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So much of what we do depends on the situation and how things look at the time as well as our comfort level working the different types. Pex is a great product line for places that get rough treatment like RV as it flexs and doesn't break as easy. That also makes it easier to fit in, around and over things without needing lots of fittings or where we need to sanke it in like through cabinets where we might not be able to reach for joints like ells or tee. The downside of Pex is that it can be strange and does need a tool to do the fittings.
PVC is good and many more will be used to working it as it is older and that makes the learning curve a bit easier for some. I like the ease and cheap of PVC for small here to there runs where I can see laying it in easy as I almost always have what I need for a small project. If I were starting over, I might never get into PVC for supply lines as Pex fits better and quicker for lots of stuff. Pex can be run like a snake and never questioned, while drilling holes for PVC has to be bigger holes or more care in aligning them.
Copper or solid iron pipe? Not for me in RV's.
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one! 
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