I live in a rain forrest. Everyone here collects 100% of their water. I have installed wood, asphalt, and metal roofs. I am past the age where I will be doing any roof work but my next roof will be metal. A friend and I went over to see our buddies new asphalt roof. My friend picked up a piece packaging and asked, "Have you read the chemicals in your roof?" When all your water comes off your roof Asphalt holds water and then sheds the rest. I have seen light rains where I gained zero water in my tank. I have seen a morning dew that shed water from my metal roof.
Yep.
I assess that roof choice is a bit of a litmus test as to whether the owner has a survivalist mindset or not.
If you prioritize rain water capture, then you probably have a survivalist mindset.
If you prioritize aesthetics of the roof, then you probably don't.
The noise issue can be addressed by putting glass wool insulation directly under the sheets, between them and the battens. When used in combination with more insulation above the ceiling, the thermal performance of the house is very much enhanced.
Iron roofs (or more correctly steel roofs) are also much more fire resistant (ie in forest fires) and storm resistant.
The homeowner with the new shingle roof and a few drums of water in the basement or few bulk packs of bottled water in the closet is the prepping equivalent of "all hat.....no cattle".
All our buildings have steel roofs and almost all have rain water capture.
We capture and store more than 50,000 gallons of rain water a year.
We use it to drink, cook, shower, flush toilets, wash clothes, wash vehicles, fight fires, mix agricultural sprays..........everything except for the gardens. We use water captured in gully dams for gardening.
Our bull even drinks rain water.......