You rang?
First of all, I AM NOT AN ELECTRICIAN.
Ok, got all that important lifesaving business out of the way, good, good.
Romax is king. I live in a house built in the waaay back, and I have flexible steel conduit everywhere. But you have to realize that inside that conduit is cotton insulated copper. You are unable to find any confirmation for your stand because there *is no confirmation* for conduit protecting electrical wires from moisture and gasses (come on. gasses?). Nails, sure. They make specialized nail guards for vulnerable places where a nail could threaten a wire.
Never dated an IBEW member, but I do have friends who are master electricians. What I've learned is that romax is vastly easier to install, and that equals cheaper. Also, unless you're putting the wires in a plenum where smoke from a fire in one part of the building might contaminate another part, wires in conduits are probably overkill. One distinct disadvantage of conduits is that they are hotter and heat is the enemy of electricity.
...
Now as for laying some pipe. That should probably be discussed in a different thread.